Sodium - wikipedia Sodium This article is about the chemical element. For the nutrient commonly called sodium, see salt. For other uses, see sodium ( disambiguation ). `` Natrium '' redirects here. For other uses, see Natrium ( disambiguation ). Sodium, Na General properties Pronunciation / ˈsoʊdiəm / SOH - dee - əm Appearance silvery white metallic Standard atomic weight ( A ) 7001229897692800000 ♠ 22.989 769 28 ( 2 ) Sodium in the periodic table Li ↑ Na ↓ neon ← sodium → magnesium Atomic number ( Z ) 11 Group, period group 1 ( alkali metals ), period 3 Block s - block Element category alkali metal Electron configuration ( Ne ) 3s Electrons per shell 2, 8, 1 Physical properties Spectral lines ​ Phase ( at STP ) solid Melting point 370.944 K ​ ( 97.794 ° C, ​ 208.029 ° F ) Boiling point 1156.090 K ​ ( 882.940 ° C, ​ 1621.292 ° F ) Density ( near r.t. ) 0.968 g / cm when liquid ( at m.p. ) 0.927 g / cm Critical point 2573 K, 35 MPa ( extrapolated ) Heat of fusion 2.60 kJ / mol Heat of vaporization 97.42 kJ / mol Molar heat capacity 28.230 J / ( mol K ) Vapor pressure P ( Pa ) 10 100 1 k 10 k 100 k at T ( K ) 554 617 697 802 946 1153 Atomic properties Oxidation states + 1, − 1 ​ ( a strongly basic oxide ) Electronegativity Pauling scale : 0.93 Ionization energies 1st : 495.8 kJ / mol 2nd : 4562 kJ / mol 3rd : 6910.3 kJ / mol ( more ) Atomic radius empirical : 186 pm Covalent radius 166 ± 9 pm Van der Waals radius 227 pm Miscellanea Crystal structure ​ body - centered cubic ( bcc ) Speed of sound thin rod 3200 m / s ( at 20 ° C ) Thermal expansion 71 μm / ( m K ) ( at 25 ° C ) Thermal conductivity 142 W / ( m K ) Electrical resistivity 47.7 nΩ m ( at 20 ° C ) Magnetic ordering paramagnetic Magnetic susceptibility + 16.0 10 cm / mol ( 298 K ) Young 's modulus 10 GPa Shear modulus 3.3 GPa Bulk modulus 6.3 GPa Mohs hardness 0.5 Brinell hardness 0.69 MPa CAS Number 7440 - 23 - 5 History Discovery and first isolation Humphry Davy ( 1807 ) Main isotopes of sodium Isotope Abundance Half - life ( t ) Decay mode Product Na trace 2.602 y β Ne Na 100 % stable Na trace 14.96 h β Mg view talk references in Wikidata Sodium is a chemical element with symbol Na ( from Latin natrium ) and atomic number 11. It is a soft, silvery - white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom -- the Na cation. Its only stable isotope is Na. The free metal does not occur in nature, but must be prepared from compounds. Sodium is the sixth most abundant element in the Earth 's crust, and exists in numerous minerals such as feldspars, sodalite and rock salt ( NaCl ). Many salts of sodium are highly water - soluble : sodium ions have been leached by the action of water from the Earth 's minerals over eons, and thus sodium and chlorine are the most common dissolved elements by weight in the oceans. Sodium was first isolated by Humphry Davy in 1807 by the electrolysis of sodium hydroxide. Among many other useful sodium compounds, sodium hydroxide ( lye ) is used in soap manufacture, and sodium chloride ( edible salt ) is a de-icing agent and a nutrient for animals including humans. Sodium is an essential element for all animals and some plants. Sodium ions are the major cation in the extracellular fluid ( ECF ) and as such are the major contributor to the ECF osmotic pressure and ECF compartment volume. Loss of water from the ECF compartment increases the sodium concentration, a condition called hypernatremia. Isotonic loss of water and sodium from the ECF compartment decreases the size of that compartment in a condition called ECF hypovolemia. By means of the sodium - potassium pump, living human cells pump three sodium ions out of the cell in exchange for two potassium ions pumped in ; comparing ion concentrations across the cell membrane, inside to outside, potassium measures about 40 : 1, and sodium, about 1 : 10. In nerve cells, the electrical charge across the cell membrane enables transmission of the nerve impulse -- an action potential -- when the charge is dissipated ; sodium plays a key role in that activity. Contents 1 Characteristics 1.1 Physical 1.2 Isotopes 2 Chemistry 2.1 Salts and oxides 2.2 Aqueous solutions 2.3 Electrides and sodides 2.4 Organosodium compounds 2.5 Intermetallic compounds 3 History 4 Occurrence 4.1 Astronomical observations 5 Commercial production 6 Applications 6.1 Heat transfer 7 Biological role 8 Safety and precautions 9 See also 10 References 11 Bibliography 12 External links Characteristics Physical Emission spectrum for sodium, showing the D line. Sodium at standard temperature and pressure is a soft silvery metal that combines with oxygen in air and forms grayish white sodium oxide unless immersed in oil or inert gas, which are the conditions it is usually stored in. Sodium metal can be easily cut with a knife and is a good conductor of electricity and heat because it has only one electron in its valence shell, resulting in weak metallic bonding and free electrons, which carry energy. Due to having low atomic mass and large atomic radius, sodium is third - least dense of all elemental metals and is one of only three metals that can float on water, the other two being lithium and potassium. The melting ( 98 ° C ) and boiling ( 883 ° C ) points of sodium are lower than those of lithium but higher than those of the heavier alkali metals potassium, rubidium, and caesium, following periodic trends down the group. These properties change dramatically at elevated pressures : at 1.5 Mbar, the color changes from silvery metallic to black ; at 1.9 Mbar the material becomes transparent with a red color ; and at 3 Mbar, sodium is a clear and transparent solid. All of these high - pressure allotropes are insulators and electrides. A positive flame test for sodium has a bright yellow color. In a flame test, sodium and its compounds glow yellow because the excited 3s electrons of sodium emit a photon when they fall from 3p to 3s ; the wavelength of this photon corresponds to the D line at about 589.3 nm. Spin - orbit interactions involving the electron in the 3p orbital split the D line into two, at 589.0 and 589.6 nm ; hyperfine structures involving both orbitals cause many more lines. Isotopes Main article : Isotopes of sodium Twenty isotopes of sodium are known, but only Na is stable. Na is created in the carbon - burning process in stars by fusing two carbon atoms together ; this requires temperatures above 600 megakelvins and a star of at least three solar masses. Two radioactive, cosmogenic isotopes are the byproduct of cosmic ray spallation : Na has a half - life of 2.6 years and Na, a half - life of 15 hours ; all other isotopes have a half - life of less than one minute. Two nuclear isomers have been discovered, the longer - lived one being Na with a half - life of around 20.2 milliseconds. Acute neutron radiation, as from a nuclear criticality accident, converts some of the stable Na in human blood to Na ; the neutron radiation dosage of a victim can be calculated by measuring the concentration of Na relative to Na. Chemistry Sodium atoms have 11 electrons, one more than the extremely stable configuration of the noble gas neon. Because of this and its low first ionization energy of 495.8 kJ / mol, the sodium atom is much more likely to lose the last electron and acquire a positive charge than to gain one and acquire a negative charge. This process requires so little energy that sodium is readily oxidized by giving up its 11th electron. In contrast, the second ionization energy is very high ( 4562 kJ / mol ), because the 10th electron is closer to the nucleus than the 11th electron. As a result, sodium usually forms ionic compounds involving the Na cation. The most common oxidation state for sodium is + 1. It is generally less reactive than potassium and more reactive than lithium. Sodium metal is highly reducing, with the standard reduction potential for the Na / Na couple being − 2.71 volts, though potassium and lithium have even more negative potentials. Salts and oxides See also : Category : Sodium compounds. Structure of sodium chloride, showing octahedral coordination around Na and Cl centres. This framework disintegrates when dissolved in water and reassembles when the water evaporates. Sodium compounds are of immense commercial importance, being particularly central to industries producing glass, paper, soap, and textiles. The most important sodium compounds are table salt ( Na Cl ), soda ash ( Na CO ), baking soda ( Na HCO ), caustic soda ( NaOH ), sodium nitrate ( Na NO ), di - and tri-sodium phosphates, sodium thiosulfate ( Na S O 5H O ), and borax ( Na B O 10H O ). In compounds, sodium is usually ionically bonded to water and anions, and is viewed as a hard Lewis acid. Two equivalent images of the chemical structure of sodium stearate, a typical soap. Most soaps are sodium salts of fatty acids. Sodium soaps have a higher melting temperature ( and seem `` harder '' ) than potassium soaps. Like all the alkali metals, sodium reacts exothermically with water, and sufficiently large pieces melt to a sphere and may explode. The reaction produces caustic soda ( sodium hydroxide ) and flammable hydrogen gas. When burned in air, it forms primarily sodium peroxide with some sodium oxide. Aqueous solutions Sodium tends to form water - soluble compounds, such as halides, sulfates, nitrates, carboxylates and carbonates. The main aqueous species are the aquo complexes ( Na ( H O ) ), where n = 4 -- 8 ; with n = 6 indicated from X-ray diffraction data and computer simulations. Direct precipitation of sodium salts from aqueous solutions is rare because sodium salts typically have a high affinity for water ; an exception is sodium bismuthate ( NaBiO ). Because of this, sodium salts are usually isolated as solids by evaporation or by precipitation with an organic solvent, such as ethanol ; for example, only 0.35 g / L of sodium chloride will dissolve in ethanol. Crown ethers, like 15 - crown - 5, may be used as a phase - transfer catalyst. Sodium content in bulk may be determined by treating with a large excess of uranyl zinc acetate ; the hexahydrate ( UO ) ZnNa ( CH CO ) 6H O precipitates and can be weighed. Caesium and rubidium do not interfere with this reaction, but potassium and lithium do. Lower concentrations of sodium may be determined by atomic absorption spectrophotometry or by potentiometry using ion - selective electrodes. Electrides and sodides Like the other alkali metals, sodium dissolves in ammonia and some amines to give deeply colored solutions ; evaporation of these solutions leaves a shiny film of metallic sodium. The solutions contain the coordination complex ( Na ( NH ) ), with the positive charge counterbalanced by electrons as anions ; cryptands permit the isolation of these complexes as crystalline solids. Sodium forms complexes with crown ethers, cryptands and other ligands. For example, 15 - crown - 5 has high affinity for sodium because the cavity size of 15 - crown - 5 is 1.7 -- 2.2 Å, which is enough to fit sodium ion ( 1.9 Å ). Cryptands, like crown ethers and other ionophores, also have a high affinity for the sodium ion ; derivatives of the alkalide Na are obtainable by the addition of cryptands to solutions of sodium in ammonia via disproportionation. Organosodium compounds The structure of the complex of sodium ( Na, shown in yellow ) and the antibiotic monensin - A. Many organosodium compounds have been prepared. Because of the high polarity of the C - Na bonds, they behave like sources of carbanions ( salts with organic anions ). Some well known derivatives include sodium cyclopentadienide ( NaC H ) and trityl sodium ( ( C H ) CNa ). Because of the large size and very low polarising power of the Na cation, it can stabilize large, aromatic, polarisable radical anions, such as in sodium naphthalenide, Na ( C H ), a strong reducing agent. Intermetallic compounds Sodium forms alloys with many metals, such as potassium, calcium, lead, and the group 11 and 12 elements. Sodium and potassium form KNa and NaK. NaK is 40 -- 90 % potassium and it is liquid at ambient temperature. It is excellent thermal and electrical conductor. Sodium - calcium alloys are by - products of electrolytic production of sodium from binary salt mixture of NaCl - CaCl and ternary mixture NaCl - CaCl - BaCl. Calcium is only partially miscible with sodium. In liquid state, sodium is completely miscible with lead. There are several methods to make sodium - lead alloys. One is to melt them together and another is to deposit sodium electrolycally on molten lead cathodes. NaPb, NaPb, Na Pb, Na Pb, and Na Pb are some of the known sodium - lead alloys. Sodium also forms alloys with gold ( NaAu ) and silver ( NaAg ). Group 12 metals ( zinc, cadmium and mercury ) are known to make alloys with sodium. NaZn and NaCd are alloys of zinc and cadmium. Sodium and mercury form NaHg, NaHg, NaHg, Na Hg, and Na Hg. History Because of its importance in human metabolism, salt has long been an important commodity, as shown by the English word salary, which derives from salarium, the wafers of salt sometimes given to Roman soldiers along with their other wages. In medieval Europe, a compound of sodium with the Latin name of sodanum was used as a headache remedy. The name sodium is thought to originate from the Arabic suda, meaning headache, as the headache - alleviating properties of sodium carbonate or soda were well known in early times. Although sodium, sometimes called soda, had long been recognized in compounds, the metal itself was not isolated until 1807 by Sir Humphry Davy through the electrolysis of sodium hydroxide. In 1809, the German physicist and chemist Ludwig Wilhelm Gilbert proposed the names Natronium for Humphry Davy 's `` sodium '' and Kalium for Davy 's `` potassium ''. The chemical abbreviation for sodium was first published in 1814 by Jöns Jakob Berzelius in his system of atomic symbols, and is an abbreviation of the element 's New Latin name natrium, which refers to the Egyptian natron, a natural mineral salt mainly consisting of hydrated sodium carbonate. Natron historically had several important industrial and household uses, later eclipsed by other sodium compounds. Sodium imparts an intense yellow color to flames. As early as 1860, Kirchhoff and Bunsen noted the high sensitivity of a sodium flame test, and stated in Annalen der Physik und Chemie : In a corner of our 60 m room farthest away from the apparatus, we exploded 3 mg. of sodium chlorate with milk sugar while observing the nonluminous flame before the slit. After a while, it glowed a bright yellow and showed a strong sodium line that disappeared only after 10 minutes. From the weight of the sodium salt and the volume of air in the room, we easily calculate that one part by weight of air could not contain more than 1 / 20 millionth weight of sodium. Occurrence The Earth 's crust contains 2.27 % sodium, making it the seventh most abundant element on Earth and the fifth most abundant metal, behind aluminium, iron, calcium, and magnesium and ahead of potassium. Sodium 's estimated oceanic abundance is 1.08 × 10 milligrams per liter. Because of its high reactivity, it is never found as a pure element. It is found in many different minerals, some very soluble, such as halite and natron, others much less soluble, such as amphibole and zeolite. The insolubility of certain sodium minerals such as cryolite and feldspar arises from their polymeric anions, which in the case of feldspar is a polysilicate. Astronomical observations In the interstellar medium, sodium is identified by the D spectral line ; though it has a high vaporization temperature, its abundance in Mercury 's atmosphere enabled its detection by Potter and Morgan using ground - based high resolution spectroscopy. Sodium has been detected in at least one comet ; astronomers watching Comet Hale - Bopp in 1997 observed a sodium tail consisting of neutral atoms ( not ions ) and extending to some 50 million kilometres behind the head. Commercial production Employed only in rather specialized applications, only about 100,000 tonnes of metallic sodium are produced annually. Metallic sodium was first produced commercially in the late 19th century by carbothermal reduction of sodium carbonate at 1100 ° C, as the first step of the Deville process for the production of aluminium : Na CO + 2 C → 2 Na + 3 CO The high demand of aluminium created the need for the production of sodium. After the introduction of the Hall -- Héroult process for the production of aluminium by electrolysing a molten salt bath ended the need for large quantities of sodium. A related process based on the reduction of sodium hydroxide was developed in 1886. Sodium is now produced commercially through the electrolysis of molten sodium chloride, based on a process patented in 1924. This is done in a Downs cell in which the NaCl is mixed with calcium chloride to lower the melting point below 700 ° C. As calcium is less electropositive than sodium, no calcium will be deposited at the cathode. This method is less expensive than the previous Castner process ( the electrolysis of sodium hydroxide ). The market for sodium is volatile due to the difficulty in its storage and shipping ; it must be stored under a dry inert gas atmosphere or anhydrous mineral oil to prevent the formation of a surface layer of sodium oxide or sodium superoxide. Applications Though metallic sodium has some important uses, the major applications for sodium use compounds ; millions of tons of sodium chloride, hydroxide, and carbonate are produced annually. Sodium chloride is extensively used for anti-icing and de-icing and as a preservative ; sodium bicarbonate is mainly used for cooking. Along with potassium, many important medicines have sodium added to improve their bioavailability ; though potassium is the better ion in most cases, sodium is chosen for its lower price and atomic weight. Sodium hydride is used as a base for various reactions ( such as the aldol reaction ) in organic chemistry, and as a reducing agent in inorganic chemistry. Metallic sodium is used mainly for the production of sodium borohydride, sodium azide, indigo, and triphenylphosphine. A once - common use was the making of tetraethyllead and titanium metal ; because of the move away from TEL and new titanium production methods, the production of sodium declined after 1970. Sodium is also used as an alloying metal, an anti-scaling agent, and as a reducing agent for metals when other materials are ineffective. Note the free element is not used as a scaling agent, ions in the water are exchanged for sodium ions. Sodium plasma ( `` vapor '' ) lamps are often used for street lighting in cities, shedding light that ranges from yellow - orange to peach as the pressure increases. By itself or with potassium, sodium is a desiccant ; it gives an intense blue coloration with benzophenone when the desiccate is dry. In organic synthesis, sodium is used in various reactions such as the Birch reduction, and the sodium fusion test is conducted to qualitatively analyse compounds. Sodium reacts with alcohol and gives alkoxides, and when sodium is dissolved in ammonia solution, it can be used to reduce alkynes to trans - alkenes. Lasers emitting light at the sodium D line are used to create artificial laser guide stars that assist in the adaptive optics for land - based visible light telescopes. Heat transfer NaK phase diagram, showing the melting point of sodium as a function of potassium concentration. NaK with 77 % potassium is eutectic and has the lowest melting point of the NaK alloys at − 12.6 ° C. Liquid sodium is used as a heat transfer fluid in some fast reactors because it has the high thermal conductivity and low neutron absorption cross section required to achieve a high neutron flux in the reactor. The high boiling point of sodium allows the reactor to operate at ambient ( normal ) pressure, but the drawbacks include its opacity, which hinders visual maintenance, and its explosive properties. Radioactive sodium - 24 may be produced by neutron bombardment during operation, posing a slight radiation hazard ; the radioactivity stops within a few days after removal from the reactor. If a reactor needs to be shut down frequently, NaK is used ; because NaK is a liquid at room temperature, the coolant does not solidify in the pipes. In this case, the pyrophoricity of potassium requires extra precautions to prevent and detect leaks. Another heat transfer application is poppet valves in high - performance internal combustion engines ; the valve stems are partially filled with sodium and work as a heat pipe to cool the valves. Biological role Main article : Sodium in biology In humans, sodium is an essential mineral that regulates blood volume, blood pressure, osmotic equilibrium and pH ; the minimum physiological requirement for sodium is 500 milligrams per day. Sodium chloride is the principal source of sodium in the diet, and is used as seasoning and preservative in such commodities as pickled preserves and jerky ; for Americans, most sodium chloride comes from processed foods. Other sources of sodium are its natural occurrence in food and such food additives as monosodium glutamate ( MSG ), sodium nitrite, sodium saccharin, baking soda ( sodium bicarbonate ), and sodium benzoate. The US Institute of Medicine set its Tolerable Upper Intake Level for sodium at 2.3 grams per day, but the average person in the United States consumes 3.4 grams per day. Studies have found that lowering sodium intake by 2 g per day tends to lower systolic blood pressure by about two to four mm Hg. It has been estimated that such a decrease in sodium intake would lead to between 9 and 17 % fewer cases of hypertension. Hypertension causes 7.6 million premature deaths worldwide each year. ( Note that salt contains about 39.3 % sodium -- the rest being chlorine and trace chemicals ; thus, 2.3 g sodium is about 5.9 g, or 2.7 ml of salt -- about half a US teaspoon. ) The American Heart Association recommends no more than 1.5 g of sodium per day. One study found that people with or without hypertension who excreted less than 3 grams of sodium per day in their urine ( and therefore were taking in less than 3 g / d ) had a higher risk of death, stroke, or heart attack than those excreting 4 to 5 grams per day. Levels of 7 g per day or more in people with hypertension were associated with higher mortality and cardiovascular events, but this was not found to be true for people without hypertension. The US FDA states that adults with hypertension and prehypertension should reduce daily intake to 1.5 g. The renin - angiotensin system regulates the amount of fluid and sodium concentration in the body. Reduction of blood pressure and sodium concentration in the kidney result in the production of renin, which in turn produces aldosterone and angiotensin, retaining sodium in the urine. When the concentration of sodium increases, the production of renin decreases, and the sodium concentration returns to normal. The sodium ion ( Na ) is an important electrolyte in neuron function, and in osmoregulation between cells and the extracellular fluid. This is accomplished in all animals by Na / K - ATPase, an active transporter pumping ions against the gradient, and sodium / potassium channels. Sodium is the most prevalent metallic ion in extracellular fluid. Unusually low or high sodium levels in humans are recognized in medicine as hyponatremia and hypernatremia. These conditions may be caused by genetic factors, ageing, or prolonged vomiting or diarrhea. In C4 plants, sodium is a micronutrient that aids metabolism, specifically in regeneration of phosphoenolpyruvate and synthesis of chlorophyll. In others, it substitutes for potassium in several roles, such as maintaining turgor pressure and aiding in the opening and closing of stomata. Excess sodium in the soil can limit the uptake of water by decreasing the water potential, which may result in plant wilting ; excess concentrations in the cytoplasm can lead to enzyme inhibition, which in turn causes necrosis and chlorosis. In response, some plants have developed mechanisms to limit sodium uptake in the roots, to store it in cell vacuoles, and restrict salt transport from roots to leaves ; excess sodium may also be stored in old plant tissue, limiting the damage to new growth. Halophytes have adapted to be able to flourish in sodium rich environments. Safety and precautions NFPA 704 fire diamond The fire diamond hazard sign for sodium metal Sodium forms flammable hydrogen and caustic sodium hydroxide on contact with water ; ingestion and contact with moisture on skin, eyes or mucous membranes can cause severe burns. Sodium spontaneously explodes in the presence of an oxidizer such as water. Fire extinguishers based on water accelerate sodium fires ; those based on carbon dioxide and bromochlorodifluoromethane should not be used on sodium fire. Metal fires are Class D, but not all Class D extinguishers are workable with sodium. An effective extinguishing agent for sodium fires is Met - L-X. Other effective agents include Lith - X, which has graphite powder and an organophosphate flame retardant, and dry sand. Sodium fires are prevented in nuclear reactors by isolating sodium from oxygen by surrounding sodium pipes with inert gas. Pool - type sodium fires are prevented using different design measures called catch pan systems. They collect leaking sodium into a leak - recovery tank where it is isolated from oxygen. See also Books View or order collections of articles Sodium Period 3 elements Alkali metals Chemical elements ( sorted alphabetically ) Chemical elements ( sorted by number ) Portals Access related topics Chemistry portal Find out more on Wikipedia 's Sister projects Media from Commons Definitions from Wiktionary Textbooks from Wikibooks Learning resources from Wikiversity References Jump up ^ Meija, J. ; et al. ( 2016 ). `` Atomic weights of the elements 2013 ( IUPAC Technical Report ) ''. Pure Appl. Chem. 88 ( 3 ) : 265 -- 91. doi : 10.1515 / pac - 2015 - 0305. Jump up ^ Magnetic susceptibility of the elements and inorganic compounds, in Lide, D.R., ed. ( 2005 ). CRC Handbook of Chemistry and Physics ( 86th ed. ). Boca Raton ( FL ) : CRC Press. ISBN 0 - 8493 - 0486 - 5. Jump up ^ Weast, Robert ( 1984 ). CRC, Handbook of Chemistry and Physics. 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Jump up ^ Humphry Davy ( 1809 ) `` Ueber einige neue Erscheinungen chemischer Veränderungen, welche durch die Electricität bewirkt werden ; insbesondere über die Zersetzung der feuerbeständigen Alkalien, die Darstellung der neuen Körper, welche ihre Basen ausmachen, und die Natur der Alkalien überhaupt '' ( On some new phenomena of chemical changes that are achieved by electricity ; particularly the decomposition of flame - resistant alkalis ( i.e., alkalies that can not be reduced to their base metals by flames ), the preparation of new substances that constitute their ( metallic ) bases, and the nature of alkalies generally ), Annalen der Physik, 31 ( 2 ) : 113 -- 175 ; see footnote p. 157. From p. 157 : `` In unserer deutschen Nomenclatur würde ich die Namen Kalium und Natronium vorschlagen, wenn man nicht lieber bei den von Herrn Erman gebrauchten und von mehreren angenommenen Benennungen Kali - Metalloid and Natron - Metalloid, bis zur völligen Aufklärung der chemischen Natur dieser räthzelhaften Körper bleiben will. Oder vielleicht findet man es noch zweckmässiger fürs Erste zwei Klassen zu machen, Metalle und Metalloide, und in die letztere Kalium und Natronium zu setzen. -- Gilbert. '' ( In our German nomenclature, I would suggest the names Kalium and Natronium, if one would not rather continue with the appellations Kali - metalloid and Natron - metalloid which are used by Mr. Erman and accepted by several ( people ), until the complete clarification of the chemical nature of these puzzling substances. Or perhaps one finds it yet more advisable for the present to create two classes, metals and metalloids, and to place Kalium and Natronium in the latter -- Gilbert. ) Jump up ^ J. Jacob Berzelius, Försök, att, genom användandet af den electrokemiska theorien och de kemiska proportionerna, grundlägga ett rent vettenskapligt system för mineralogien ( Attempt, by the use of electrochemical theory and chemical proportions, to found a pure scientific system for mineralogy ) ( Stockholm, Sweden : A. Gadelius, 1814 ), p. 87. Jump up ^ van der Krogt, Peter. `` Elementymology & Elements Multidict ''. Retrieved 2007 - 06 - 08. Jump up ^ Andrew Shortland, Lukas Schachner, Ian Freestone, and Michael Tite. `` Natron as a flux in the early vitreous materials industry : sources, beginnings and reasons for decline ''. Journal of Archaeological Science. 33 : 521 -- 530. doi : 10.1016 / j. jas. 2005.09. 011. CS1 maint : Multiple names : authors list ( link ) Jump up ^ Kirchhoff, G. ; Bunsen, R. ( 1860 ). `` Chemische Analyse durch Spectralbeobachtungen ''. Annalen der Physik und Chemie. 186 ( 6 ) : 161 -- 189. Bibcode : 1860AnP... 186... 161K. doi : 10.1002 / andp. 18601860602. Jump up ^ Greenwood and Earnshaw, p. 69 Jump up ^ Lide, David R. ( 2003 - 06 - 19 ). CRC Handbook of Chemistry and Physics, 84th Edition. CRC Handbook. CRC Press. 14 : Abundance of Elements in the Earth 's Crust and in the Sea. ISBN 978 - 0 - 8493 - 0484 - 2. Jump up ^ Cremonese, G ; Boehnhardt, H ; Crovisier, J ; Rauer, H ; Fitzsimmons, A ; Fulle, M ; Licandro, J ; Pollacco, D ; et al. ( 1997 ). `` Neutral Sodium from Comet Hale -- Bopp : A Third Type of Tail ''. The Astrophysical Journal Letters. 490 ( 2 ) : L199 -- L202. Bibcode : 1997ApJ... 490L. 199C. arXiv : astro - ph / 9710022. doi : 10.1086 / 311040. Jump up ^ B. Pearson ( ed. ). Speciality Chemicals : Innovations in industrial synthesis and applications ( illustrated ed. ). Springer Science & Business Media, 1991. p. 260. ISBN 1 - 85166 - 646 - X. ^ Jump up to : Eggeman, Tim ; Updated By Staff ( 2007 ). `` Sodium and Sodium Alloys ''. Kirk - Othmer Encyclopedia of Chemical Technology. John Wiley & Sons. ISBN 0 - 471 - 23896 - 1. doi : 10.1002 / 0471238961.1915040912051311. a01. pub3. Jump up ^ Oesper, R.E. ; Lemay, P. ( 1950 ). `` Henri Sainte - Claire Deville, 1818 -- 1881 ''. Chymia. 3 : 205 -- 221. JSTOR 27757153. doi : 10.2307 / 27757153. Jump up ^ Banks, Alton ( 1990 ). `` Sodium ''. Journal of Chemical Education. 67 ( 12 ) : 1046. Bibcode : 1990JChEd... 67.1046 B. doi : 10.1021 / ed067p1046. Jump up ^ Pauling, Linus, General Chemistry, 1970 ed., Dover Publications Jump up ^ `` Los Alamos National Laboratory -- Sodium ''. Retrieved 2007 - 06 - 08. Jump up ^ Sodium Metal from France. DIANE Publishing. ISBN 1 - 4578 - 1780 - 2. Jump up ^ Mark Anthony Benvenuto. Industrial Chemistry : For Advanced Students ( illustrated ed. ). Walter de Gruyter GmbH & Co KG, 2015. ISBN 3 - 11 - 038339 - X. 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Small - Scale Synthesis of Laboratory Reagents with Reaction Modeling. CRC Press. pp. 91 -- 92. ISBN 978 - 1 - 4398 - 1312 - 6. OCLC 669160695. Jump up ^ Sethi, Arun ( 1 January 2006 ). Systematic Laboratory Experiments in Organic Chemistry. New Age International. pp. 32 -- 35. ISBN 978 - 81 - 224 - 1491 - 2. OCLC 86068991. Jump up ^ Smith, Michael. Organic Synthesis ( 3 ed. ). Academic Press, 2011. p. 455. ISBN 0 - 12 - 415884 - 6. Jump up ^ Solomons & Fryhle. Organic Chemistry ( 8 ed. ). John Wiley & Sons, 2006. p. 272. ISBN 81 - 265 - 1050 - 1. CS1 maint : Uses authors parameter ( link ) Jump up ^ `` Laser Development for Sodium Laser Guide Stars at ESO '' ( PDF ). Domenico Bonaccini Calia, Yan Feng, Wolfgang Hackenberg, Ronald Holzlöhner, Luke Taylor, Steffan Lewis. Jump up ^ van Rossen, G.L.C.M. ; van Bleiswijk, H. ( 1912 ). `` Über das Zustandsdiagramm der Kalium - Natriumlegierungen ''. Zeitschrift für anorganische Chemie. 74 : 152 -- 156. doi : 10.1002 / zaac. 19120740115. Jump up ^ Sodium as a Fast Reactor Coolant presented by Thomas H. Fanning. Nuclear Engineering Division. U.S. Department of Energy. U.S. Nuclear Regulatory Commission. Topical Seminar Series on Sodium Fast Reactors. May 3, 2007 ^ Jump up to : `` Sodium - cooled Fast Reactor ( SFR ) '' ( PDF ). Office of Nuclear Energy, U.S. Department of Energy. 18 February 2015. Jump up ^ Fire and Explosion Hazards. Research Publishing Service, 2011. p. 363. ISBN 981 - 08 - 7724 - 2. Jump up ^ Pavel Solomonovich Knopov, Panos M. Pardalos ( eds. ). Simulation and Optimization Methods in Risk and Reliability Theory. Nova Science Publishers, 2009. p. 150. ISBN 1 - 60456 - 658 - 2. CS1 maint : Uses editors parameter ( link ) Jump up ^ McKillop, Allan A. Proceedings of the Heat Transfer and Fluid Mechanics Institute. Stanford University Press, 1976. p. 97. ISBN 0 - 8047 - 0917 - 3. Jump up ^ U.S. Atomic Energy Commission. Reactor Handbook : Engineering ( 2 ed. ). Interscience Publishers. p. 325. Jump up ^ A US US2949907 A, Tauschek Max J, `` Coolant - filled poppet valve and method of making same '', published 23 Aug 1960 Jump up ^ `` Sodium '' ( PDF ). Northwestern University. Archived from the original ( PDF ) on 2011 - 08 - 23. Retrieved 2011 - 11 - 21. Jump up ^ `` Sodium and Potassium Quick Health Facts ''. health.ltgovernors.com. Jump up ^ `` Sodium in diet ''. MedlinePlus, US National Library of Medicine. 5 October 2016. Jump up ^ `` Reference Values for Elements ''. Dietary Reference Intakes Tables. Health Canada. Jump up ^ U.S. Department of Agriculture ; U.S. Department of Health and Human Services ( December 2010 ). Dietary Guidelines for Americans, 2010 ( PDF ) ( 7th ed. ). p. 22. ISBN 978 - 0 - 16 - 087941 - 8. OCLC 738512922. Archived from the original ( PDF ) on 6 February 2011. Retrieved 2011 - 11 - 23. ^ Jump up to : Geleijnse, J.M. ; Kok, F.J. ; Grobbee, D.E. ( 2004 ). `` Impact of dietary and lifestyle factors on the prevalence of hypertension in Western populations '' ( PDF ). European Journal of Public Health. 14 ( 3 ) : 235 -- 239. PMID 15369026. doi : 10.1093 / eurpub / 14.3. 235. Jump up ^ Lawes, C.M. ; Vander Hoorn, S. ; Rodgers, A. ; International Society of Hypertension ( 2008 ). `` Global burden of blood - pressure - related disease, 2001 ''. Lancet. 371 ( 9623 ) : 1513 -- 1518. PMID 18456100. doi : 10.1016 / S0140 - 6736 ( 08 ) 60655 - 8. Jump up ^ Armstrong, James ( 2011 ). General, Organic, and Biochemistry : An Applied Approach. Cengage Learning. pp. 48 --. ISBN 1 - 133 - 16826 - 4. Jump up ^ Table Salt Conversion. Traditionaloven.com. Retrieved on 2015 - 11 - 11. ^ Jump up to : `` Sodium in Your Diet : Use the Nutrition Facts Label and Reduce Your Intake ''. US Food and Drug Administration. 2 June 2016. Retrieved 15 October 2016. Jump up ^ `` How much sodium should I eat per day ? ''. American Heart Association. 2016. Retrieved 15 October 2016. Jump up ^ Andrew Mente ; et al. ( 2016 ). `` Associations of urinary sodium excretion with cardiovascular events in individuals with and without hypertension : a pooled analysis of data from four studies ''. The Lancet. 388 : 465 -- 75. PMID 27216139. doi : 10.1016 / S0140 - 6736 ( 16 ) 30467 - 6. CS1 maint : Explicit use of et al. ( link ) Jump up ^ McGuire, Michelle ; Beerman, Kathy A. ( 2011 ). Nutritional Sciences : From Fundamentals to Food. Cengage Learning. p. 546. ISBN 978 - 0 - 324 - 59864 - 3. OCLC 472704484. Jump up ^ Campbell, Neil ( 1987 ). Biology. Benjamin / Cummings. p. 795. ISBN 0 - 8053 - 1840 - 2. Jump up ^ Srilakshmi, B. ( 2006 ). Nutrition Science ( 2nd ed. ). New Age International. p. 318. ISBN 978 - 81 - 224 - 1633 - 6. OCLC 173807260. Jump up ^ Pohl, Hanna R. ; Wheeler, John S. ; Murray, H. Edward ( 2013 ). Astrid Sigel ; Helmut Sigel ; Roland K.O. Sigel, eds. Interrelations between Essential Metal Ions and Human Diseases. Metal Ions in Life Sciences. 13. Springer. pp. 29 -- 47. doi : 10.1007 / 978 - 94 - 007 - 7500 - 8_2. Jump up ^ Kering, M.K. ( 2008 ). `` Manganese Nutrition and Photosynthesis in NAD - malic enzyme C4 plants Ph. D. dissertation '' ( PDF ). University of Missouri - Columbia. Retrieved 2011 - 11 - 09. Jump up ^ Subbarao, G.V. ; Ito, O. ; Berry, W.L. ; Wheeler, R.M. ( 2003 ). `` Sodium -- A Functional Plant Nutrient ''. Critical Reviews in Plant Sciences. 22 ( 5 ) : 391 -- 416. doi : 10.1080 / 07352680390243495. Jump up ^ Zhu, J.K. ( 2001 ). `` Plant salt tolerance ''. Trends in Plant Science. 6 ( 2 ) : 66 -- 71. PMID 11173290. doi : 10.1016 / S1360 - 1385 ( 00 ) 01838 - 0. ^ Jump up to : `` Plants and salt ion toxicity ''. Plant Biology. Retrieved 2010 - 11 - 02. Jump up ^ Hazard Rating Information for NFPA Fire Diamonds. Ehs.neu.edu. Retrieved on 2015 - 11 - 11. Jump up ^ Angelici, R.J. ( 1999 ). Synthesis and Technique in Inorganic Chemistry. Mill Valley, CA : University Science Books. ISBN 0 - 935702 - 48 - 2. Jump up ^ Routley, J. Gordon. Sodium Explosion Critically Burns Firefighters : Newton, Massachusetts. U.S. Fire Administration. FEMA, 2013. ^ Jump up to : Prudent Practices in the Laboratory : Handling and Disposal of Chemicals. National Research Council ( U.S. ). Committee on Prudent Practices for Handling, Storage, and Disposal of Chemicals in Laboratories. National Academies, 1995. p. 390. Jump up ^ `` Sodium and Salt ''. www.heart.org. Retrieved 2016 - 09 - 05. Jump up ^ Ladwig, Thomas H. Industrial fire prevention and protection. Van Nostrand Reinhold, 1991. p. 178. ISBN 0 - 442 - 23678 - 6. ^ Jump up to : Günter Kessler. Sustainable and Safe Nuclear Fission Energy : Technology and Safety of Fast and Thermal Nuclear Reactors ( illustrated ed. ). Springer Science & Business Media, 2012. p. 446. ISBN 3 - 642 - 11990 - 5. Bibliography Greenwood, Norman N. ; Earnshaw, Alan ( 1997 ). Chemistry of the Elements ( 2nd ed. ). Butterworth - Heinemann. ISBN 0 - 08 - 037941 - 9. External links Sodium at The Periodic Table of Videos ( University of Nottingham ) Etymology of `` natrium '' -- source of symbol Na The Wooden Periodic Table Table 's Entry on Sodium Sodium isotopes data from The Berkeley Laboratory Isotopes Project 's Periodic table ( Large cells ) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 He Li Be O Ne Na Mg Al Si Cl Ar Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te Xe 6 Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 7 Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og Alkali metal Alkaline earth metal Lanthanide Actinide Transition metal Post - ​ transition metal Metalloid Polyatomic nonmetal Diatomic nonmetal Noble gas Unknown chemical properties Sodium compounds NaAlO NaBH NaBH ( CN ) NaBO NaBiO NaBr NaBrO NaBrO NaCH COO NaC H CO NaC H ( OH ) CO NaCN NaCl NaClO NaClO NaClO NaClO NaF Na FeO NaH NaHCO NaH PO NaHSO NaHSO NaI NaIO NaIO Na IO NaMnO NaN NaNH NaNO NaNO NaOCN NaO NaO NaOH NaPO H NaReO NaSCN NaSH NaTcO NaVO Na CO Na C O Na CrO Na Cr O Na GeO Na MnO Na MnO Na MoO Na MoS Na N O Na O Na O Na O ( UO ) Na PO F Na S Na SO Na SO Na S O Na S O Na S O Na S O Na S O Na S O Na S O Na Se Na SeO Na SeO Na SiO Na Si O Na SiO Na Te Na TeO Na TeO Na Po Na Ti O Na U O NaWO Na Zn ( OH ) Na N Na P Na PO Na VO Na Fe ( CN ) Na P O Na P O Chemical formulas LCCN : sh85124249 GND : 4171239 - 0 BNF : cb11980515x ( data ) NDL : 00568053 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Sodium&oldid=802495699 '' Categories : Sodium Chemical elements Alkali metals Sodium minerals Desiccants Dietary minerals Biology and pharmacology of chemical elements Reducing agents Nuclear reactor coolants Hidden categories : CS1 German - language sources ( de ) CS1 maint : Multiple names : authors list CS1 maint : Uses authors parameter CS1 maint : Uses editors parameter CS1 maint : Explicit use of et al. 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Question: na is the symbol for which of the following chemical elements
Answer: Sodium