Period 7 element - wikipedia Period 7 element Period 7 in the periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury ( element ) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Part of a series on the Periodic table Periodic table forms 18 - column large cells 32 - column ( large cells ) Alternative forms Janet 's left step Beyond period 7 Fricke large cells Pyykkö Periodic table history Dmitri Mendeleev predictions Discovery of elements Naming & etymology for places for scientists controversies ( in East Asia ) Systematic element names Sets of elements By periodic table structure Groups ( 1 -- 18 ) 1 ( alkali metals ) 2 ( alkaline earth metals ) 5 6 7 8 9 10 11 12 13 14 15 ( pnictogens ) 16 ( chalcogens ) 17 ( halogens ) 18 ( noble gases ) Periods ( 1 -- 7... ) 5 6 7 8 + Aufbau Fricke Pyykkö Blocks ( s, p, d, f,... ) Atomic orbitals Aufbau principle By metallic classification Metals alkali alkaline earth transition post-transition lanthanide actinide ( superactinide ) Metalloids dividing metals & nonmetals Nonmetals reactive nonmetals noble gases By other characteristics Coinage metals Platinum - group metals Precious metals Refractory metals Heavy metals Light metals Native metals Noble metals Main - group elements Rare - earth elements Transuranium, transplutonium elements Major, minor & trans - actinides Elements List of chemical elements by abundance ( in human body ) by atomic properties by isotope stability by annual production by symbol Properties of elements Atomic weight Crystal structure Electron affinity configuration Electronegativity ( Allen, Pauling ) Goldschmidt classification Nutrition Valence Data pages for elements Abundance Atomic radius Boiling point Critical point Density Elasticity Electrical resistivity Electron affinity / configuration Electronegativity Hardness Heat capacity / of fusion / of vaporization Ionization energy Melting point Oxidation state Speed of sound Thermal conductivity / expansion coefficient Vapor pressure Book Category Chemistry Portal A period 7 element is one of the chemical elements in the seventh row ( or period ) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring ( periodic ) trends in the chemical behaviour of the elements as their atomic number increases : a new row is begun when chemical behaviour begins to repeat, meaning that elements with similar behaviour fall into the same vertical columns. The seventh period contains 32 elements, tied for the most with period 6, beginning with francium and ending with oganesson, the heaviest element currently discovered. As a rule, period 7 elements fill their 7s shells first, then their 5f, 6d, and 7p shells, in that order ; however, there are exceptions, such as plutonium. Contents 1 Properties 2 Elements 3 Francium and radium 4 Actinides 5 Transactinides 6 Notes 7 References Properties All elements of period 7 are radioactive. This period contains the actinides, which contains the heaviest naturally occurring element, plutonium ; subsequent elements must be synthesized artificially. Whilst the first five of these are now available in macroscopic quantities, most are extremely rare, having only been prepared in microgram amounts or less. The later, transactinide elements have only been identified in laboratories in batches of a few atoms at a time. Although the rarity of many of these elements means that experimental results are not very extensive, their periodic and group trends are less well defined than other periods. Whilst francium and radium do show typical properties of their respective groups, actinides display a much greater variety of behaviour and oxidation states than the lanthanides. These peculiarities are due to a variety of factors, including a large degree of spin - orbit coupling and relativistic effects, ultimately caused by the very high positive electrical charge from their massive atomic nuclei. Elements Chemical element Chemical series Electron configuration Occurrence 87 Fr Francium Alkali metal ( Rn ) 7s From decay 88 Ra Radium Alkaline earth metal ( Rn ) 7s From decay 89 Ac Actinium Actinide ( Rn ) 6d 7s From decay 90 Th Thorium Actinide ( Rn ) 6d 7s ( * ) Primordial 91 Pa Protactinium Actinide ( Rn ) 5f 6d 7s From decay 92 U Uranium Actinide ( Rn ) 5f 6d 7s Primordial 93 Np Neptunium Actinide ( Rn ) 5f 6d 7s From decay 94 Pu Plutonium Actinide ( Rn ) 5f 7s ( * ) From decay 95 Am Americium Actinide ( Rn ) 5f 7s ( * ) Synthetic 96 Cm Curium Actinide ( Rn ) 5f 6d 7s Synthetic 97 Bk Berkelium Actinide ( Rn ) 5f 7s ( * ) Synthetic 98 Cf Californium Actinide ( Rn ) 5f 7s ( * ) Synthetic 99 Es Einsteinium Actinide ( Rn ) 5f 7s ( * ) Synthetic 100 Fm Fermium Actinide ( Rn ) 5f 7s ( * ) Synthetic 101 Md Mendelevium Actinide ( Rn ) 5f 7s ( * ) Synthetic 102 No Nobelium Actinide ( Rn ) 5f 7s ( * ) Synthetic 103 Lr Lawrencium Actinide ( Rn ) 5f 7s 7p ( * ) Synthetic 104 Rf Rutherfordium Transition metal ( Rn ) 5f 6d 7s Synthetic 105 Db Dubnium Transition metal ( Rn ) 5f 6d 7s Synthetic 106 Sg Seaborgium Transition metal ( Rn ) 5f 6d 7s Synthetic 107 Bh Bohrium Transition metal ( Rn ) 5f 6d 7s Synthetic 108 Hs Hassium Transition metal ( Rn ) 5f 6d 7s Synthetic 109 Mt Meitnerium Transition metal ( ? ) ( Rn ) 5f 6d 7s ( ? ) Synthetic 110 Ds Darmstadtium Transition metal ( ? ) ( Rn ) 5f 6d 7s ( ? ) Synthetic 111 Rg Roentgenium Transition metal ( ? ) ( Rn ) 5f 6d 7s ( ? ) Synthetic 112 Cn Copernicium Post-transition metal ( Rn ) 5f 6d 7s ( ? ) Synthetic 113 Nh Nihonium Post-transition metal ( ? ) ( Rn ) 5f 6d 7s 7p ( ? ) Synthetic 114 Fl Flerovium Post-transition metal ( ? ) ( Rn ) 5f 6d 7s 7p ( ? ) Synthetic 115 Mc Moscovium Post-transition metal ( ? ) ( Rn ) 5f 6d 7s 7p ( ? ) Synthetic 116 Lv Livermorium Post-transition metal ( ? ) ( Rn ) 5f 6d 7s 7p ( ? ) Synthetic 117 Ts Tennessine Post-transition metal ( ? ) ( Rn ) 5f 6d 7s 7p ( ? ) Synthetic 118 Og Oganesson Noble gas ( ? ) ( Rn ) 5f 6d 7s 7p ( ? ) Synthetic ( ? ) Prediction ( * ) Exception to the Madelung rule. Francium and radium Main articles : Francium and Radium Francium and radium make up the s - block elements of the 7th period. Francium ( / ˈfrænsiəm / FRAN - see - əm ) is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka - caesium and actinium K. It is one of the two least electronegative elements, the other being caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron. Francium was discovered by Marguerite Perey in France ( from which the element takes its name ) in 1939. It was the last element discovered in nature, rather than by synthesis. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium - 223 continually forms and decays. As little as 20 -- 30 g ( one ounce ) exists at any given time throughout the Earth 's crust ; the other isotopes are entirely synthetic. The largest amount produced in the laboratory was a cluster of more than 300,000 atoms. Radium ( / ˈreɪdiəm / RAY - dee - əm ) is a chemical element with atomic number 88, represented by the symbol Ra. Radium is an almost pure - white alkaline earth metal, but it readily oxidizes on exposure to air, becoming black in color. All isotopes of radium are highly radioactive, with the most stable isotope being radium - 226, which has a half - life of 1601 years and decays into radon gas. Because of such instability, radium is luminescent, glowing a faint blue. Radium, in the form of radium chloride, was discovered by Marie Skłodowska - Curie and Pierre Curie in 1898. They extracted the radium compound from uraninite and published the discovery at the French Academy of Sciences five days later. Radium was isolated in its metallic state by Marie Curie and André - Louis Debierne through the electrolysis of radium chloride in 1910. Since its discovery, it has given names like radium A and radium C to several isotopes of other elements that are decay products of radium - 226. In nature, radium is found in uranium ores in trace amounts as small as a seventh of a gram per ton of uraninite. Radium is not necessary for living organisms, and adverse health effects are likely when it is incorporated into biochemical processes because of its radioactivity and chemical reactivity. Actinides Main article : Actinide The atomic bomb dropped on Nagasaki had a plutonium charge. The actinide or actinoid ( IUPAC nomenclature ) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. The actinide series derives its name from the group 3 element actinium. All but one of the actinides are f - block elements, corresponding to the filling of the 5f electron shell ; actinium, a d - block element, is also generally considered an actinide. In comparison with the lanthanides, also mostly f - block elements, the actinides show much more variable valence. Of the actinides, thorium and uranium occur naturally in substantial, primordial, quantities. The radioactive decay of uranium produces transient amounts of actinium, protactinium and plutonium, and atoms of neptunium are occasionally produced from transmutation reactions in uranium ores. The other actinides are purely synthetic elements, although the first six actinides after plutonium would have been produced during the Oklo phenomenon ( and long since decayed away ), and curium almost certainly previously existed in nature as an extinct radionuclide. Nuclear weapons tests have released at least six actinides heavier than plutonium into the environment ; analysis of debris from a 1952 hydrogen bomb explosion showed the presence of americium, curium, berkelium, californium, einsteinium and fermium. All actinides are radioactive and release energy upon radioactive decay ; naturally occurring uranium and thorium, and synthetically produced plutonium are the most abundant actinides on Earth. These are used in nuclear reactors and nuclear weapons. Uranium and thorium also have diverse current or historical uses, and americium is used in the ionization chambers of most modern smoke detectors. In presentations of the periodic table, the lanthanides and the actinides are customarily shown as two additional rows below the main body of the table, with placeholders or else a selected single element of each series ( either lanthanum or lutetium, and either actinium or lawrencium, respectively ) shown in a single cell of the main table, between barium and hafnium, and radium and rutherfordium, respectively. This convention is entirely a matter of aesthetics and formatting practicality ; a rarely used wide - formatted periodic table ( 32 columns ) shows the lanthanide and actinide series in their proper columns, as parts of the table 's sixth and seventh rows ( periods ). Transactinides Main article : Transactinide elements Transactinide elements ( also, transactinides, or super-heavy elements ) are the chemical elements with atomic numbers greater than those of the actinides, the heaviest of which is lawrencium ( 103 ). All transactinides of period 7 have been discovered, up to oganesson ( element 118 ). Transactinide elements are also transuranic elements, that is, have an atomic number greater than that of uranium ( 92 ), an actinide. The further distinction of having an atomic number greater than the actinides is significant in several ways : The transactinide elements all have electrons in the 6d subshell in their ground state ( and thus are placed in the d - block ). Except for the first two transactinides, rutherfordium and dubnium, even the longest - lasting isotopes of transactinide elements have extremely short half - lives, measured in seconds, or smaller units. The element naming controversy involved the first five or six transactinide elements. These elements thus used three - letter systematic names for many years after their discovery had been confirmed. ( Usually the three - letter symbols are replaced with two - letter symbols relatively shortly after a discovery has been confirmed. ) Transactinides are radioactive and have only been obtained synthetically in laboratories. None of these elements has ever been collected in a macroscopic sample. Transactinide elements are all named after nuclear physicists and chemists or important locations involved in the synthesis of the elements. Chemistry Nobel Prize winner Glenn T. Seaborg who first proposed the actinide concept which led to the acceptance of the actinide series also proposed the existence of a transactinide series ranging from element 104 to 121 and a superactinide series approximately spanning elements 122 to 153. The transactinide seaborgium is named in his honor. IUPAC defines an element to exist if its lifetime is longer than 10 seconds, the time needed for the nucleus to form an electronic cloud. Notes Jump up ^ Actually the least unstable isotope, francium - 223 Jump up ^ Some synthetic elements, like technetium, have later been found in nature. References Jump up ^ Luis A. Orozco ( 2003 ). `` Francium ''. Chemical and Engineering News. Jump up ^ The Manhattan Project. An Interactive History. US Department of Energy ^ Jump up to : Gray, Theodore ( 2009 ). The Elements : A Visual Exploration of Every Known Atom in the Universe. New York : Black Dog & Leventhal Publishers. p. 240. ISBN 978 - 1 - 57912 - 814 - 2. Jump up ^ Actinide element, Encyclopædia Britannica on - line Jump up ^ Although `` actinoid '' ( rather than `` actinide '' ) means `` actinium - like '' and therefore should exclude actinium, that element it is usually included in the series. Jump up ^ Connelly, Neil G. ; et al. ( 2005 ). `` Elements ''. Nomenclature of Inorganic Chemistry. London : Royal Society of Chemistry. p. 52. ISBN 0 - 85404 - 438 - 8. Jump up ^ Greenwood, p. 1250 Jump up ^ Fields, P. ; Studier, M. ; Diamond, H. ; Mech, J. ; Inghram, M. ; Pyle, G. ; Stevens, C. ; Fried, S. ; Manning, W. ( 1956 ). `` Transplutonium Elements in Thermonuclear Test Debris ''. Physical Review. 102 ( 1 ) : 180. Bibcode : 1956PhRv... 102... 180F. doi : 10.1103 / PhysRev. 102.180. Jump up ^ IUPAC Provisional Recommendations for the Nomenclature of Inorganic Chemistry ( 2004 ) Archived 2006 - 10 - 27 at the Wayback Machine. ( online draft of an updated version of the `` Red Book '' IR 3 -- 6 ) Jump up ^ Morss, Lester R. ; Edelstein, Norman M. ; Fuger, Jean, eds. ( 2006 ). The Chemistry of the Actinide and Transactinide Elements ( 3rd ed. ). Dordrecht, The Netherlands : Springer. ISBN 978 - 1 - 4020 - 3555 - 5. Jump up ^ http://www.kernchemie.de/Transactinides/Transactinide-2/transactinide-2.html Periodic table Periodic table forms Standard 18 - column 18 - column, large cells 32 - column, large cells Alternative Alternatives Janet 's left step table Extended Extension beyond the 7th period Fricke model large cells Pyykkö model Sets of elements By periodic table structure Groups 1 ( Alkali metals ) 2 ( Alkaline earth metals ) 5 6 7 8 9 10 11 12 13 14 15 ( Pnictogens ) 16 ( Chalcogens ) 17 ( Halogens ) 18 ( Noble gases ) Periods 5 6 7 8 + Aufbau Fricke Pyykkö Blocks s - block p - block d - block f - block g - block Aufbau principle By metallicity Metals Alkali metals Alkaline earth metals Lanthanides Actinides Transition metals Post-transition metals Metalloids Lists of metalloids by source Dividing line Nonmetals Reactive nonmetals Noble gases Other sets Nutritional elements Platinum - group metals ( PGM ) Rare - earth elements Refractory metals Precious metals Coinage metals Noble metal Heavy metals Native metals Transuranium elements Transactinide elements Major actinides Minor actinides Elements Lists By : Abundance ( in humans ) Atomic properties Nuclear stability Production Symbol Properties Atomic weight Crystal structure Electron affinity Electron configuration Electronegativity Allen Pauling Goldschmidt classification Maximum valence Data pages Abundance Atomic radius Boiling point Critical point Density Elasticity Electrical resistivity Electron affinity Electron configuration Electronegativity Hardness Heat capacity Heat of fusion Heat of vaporization Ionization energy Melting point Oxidation state Speed of sound Thermal conductivity Thermal expansion coefficient Vapor pressure History Element discoveries Mendeleev 's predictions Naming Etymology controversies places scientists in East Asia See also IUPAC nomenclature systematic element name Trivial name Dmitri Mendeleev Book Category Chemistry Portal Periodic table ( Large cells ) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 He Li Be 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 Reactive nonmetal Noble gas Unknown chemical properties Retrieved from `` https://en.wikipedia.org/w/index.php?title=Period_7_element&oldid=831185977 '' Categories : Periods ( periodic table ) Hidden categories : Webarchive template wayback links Talk Contents About Wikipedia Aragonés Asturianu Azərbaycanca বাংলা भोजपुरी Català Čeština Cymraeg Dansk Deutsch Español Esperanto Euskara فارسی Français 한국어 Bahasa Indonesia Interlingua Italiano Lumbaart Македонски Nederlands 日本 語 Nordfriisk Polski Русский Simple English Slovenčina Српски / srpski Srpskohrvatski / српскохрватски Suomi தமிழ் ไทย Türkçe Tiếng Việt 中文 28 more Edit links This page was last edited on 19 March 2018, at 07 : 05. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what is the largest metalloid on the periodic table
Answer: plutonium