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Current symbols
SymbolNameEtymology of symbolAtomic numberRelative atomic massGroupPeriodAcActiniumfrom Greek aktinos89&227[227]The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However, three elements, thorium, protactinium, and uranium, have a characteristic terrestrial isotopic composition, and thus their atomic mass given. 7AgSilverLatin argentum47&107.86822107.8682(2)The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.115AlAluminium (Aluminum)Latin alumen13&026.9815386826.9815386(8)133AmAmericiumthe Americas95&243[243] 7ArArgonGreek argon18&039.948139.948(1)The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.183|}</onlyinclude>AsArsenicGreek arsenikos33&074.92160274.92160(2)154AtAstatineGreek astatos85&210[210]176AuGoldLatin aurum79&196.9665694196.966569(4)116BBoronborax5&010.811710.811(7)The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.132BaBariumGreek barys56&137.3277137.327(7)26BeBerylliumberyl4&009.01218239.012182(3)22BhBohriumNiels Bohr107&264[264]77BiBismuth from German wissmuth83&208.980401208.98040(1)156BkBerkeliumBerkeley, California97&247[247] 7BrBromineGreek bromos35&079.904179.904(1)174CCarbonLatin carbo6&012.0107812.0107(8)142CaCalciumLatin calx20&040.078440.078(4)24CdCadmiumfrom Greek kadmia48&112.4118112.411(8)125CeCeriumCeres58&140.1161140.116(1) 6CfCaliforniumState and University of California98&251[251] 7ClChlorineGreek chloros17&035.453235.453(2)173CmCuriumPierre and Marie Curie and the traditional -um ending96&247[247] 7CnCoperniciumNicolaus Copernicus 112&285[285]127CoCobaltfrom German kobold27&058.933195558.933195(5)94CrChromiumGreek chroma24&051.9961651.9961(6)64CsCaesium (Cesium)Latin caesius55&132.90545192132.9054519(2)16CuCopperLatin Cuprum29&063.546363.546(3)114DbDubniumDubna, Russia105&262[262]57DsDarmstadtiumDarmstadt, Germany110&271[271]107DyDysprosiumGreek dysprositos66&162.5001162.500(1) 6ErErbiumYtterby, Sweden68&167.2593167.259(3) 6EsEinsteiniumAlbert Einstein99&252[252] 7EuEuropiumEurope63&151.9641151.964(1) 6FFluorineLatin fluo9&018.9984032518.9984032(5)172FeIronLatin ferrum26&055.845255.845(2)84FmFermiumEnrico Fermi100&257[257] 7FrFranciumFrance87&223[223]17GaGalliumLatin Gallia31&069.723169.723(1)134GdGadoliniumgadolinite64&157.253157.25(3) 6GeGermaniumGermany32&072.64172.64(1)144HHydrogenhydrogenes]]||1||&001.0079471.00794(7)||1||1
|-style="background-color:#c0ffff"
|He||Helium||Greek helios||2||&004.00260224.002602(2)||18||1
|-style="background-color:#ffc0c0"
|Hf||Hafnium||Latin Hafnia||72||&178.492178.49(2)||4||6
|-style="background-color:#ffc0c0"
|Hg||Mercury||Latin hydrargyrum||80||&200.592200.59(2)||12||6
|-style="background-color:#ffbfff"
|Ho||Holmium||Latin Holmia||67||&164.930322164.930 32(2)|| ||6
|-style="background-color:#ffc0c0"
|Hs||Hassium||Hesse, Germany||108||&277[277]||8||7
|-style="background-color:#ffff99"
|I||Iodine||Greek ioeides||53||&126.904473126.904 47(3)||17||5
|-style="background-color:#cccccc"
|In||Indium||indigo blue||49||&114.8183114.818(3)||13||5
|-style="background-color:#ffc0c0"
|Ir||Iridium||Greek iris||77||&192.2173192.217(3)||9||6
|-style="background-color:#ff6666"
|K||Potassium (Kalium)||Latin kalium||19||&039.0983139.0983(1)||1||4
|-style="background-color:#c0ffff"
|Kr||Krypton||Greek kryptos||36||&083.798283.798(2)||18||4
|-style="background-color:#ffbfff"
|La||Lanthanum||Greek lanthanien||57||&138.905477138.90547(7)|| ||6
|-style="background-color:#ff6666"
|Li||Lithium||Greek lithos||3||&006.94126.941(2)The atomic weight of commercial Lithium can vary between 6.939 and 6.996—analysis of the specific material is necessary to find a more accurate value.||1||2
|-style="background-color:#ff99cc"
|Lr||Lawrencium||Ernest O. Lawrence||103||&262[262]||3||7
|-style="background-color:#ffbfff"
|Lu||Lutetium||Latin Lutetia||71||&174.9671174.967(1)||3||6
|-style="background-color:#ff99cc"
|Md||Mendelevium||Dmitri Mendeleyev||101||&258[258]|| ||7
|-style="background-color:#ffdead"
|Mg||Magnesium||Magnesia, Greece||12||&024.3050624.3050(6)||2||3
|-style="background-color:#ffc0c0"
|Mn||Manganese||Latin magnes||25||&054.938045554.938045(5)||7||4
|-style="background-color:#ffc0c0"
|Mo||Molybdenum||Greek molybdos||42||&095.94295.94(2)||6||5
|-style="background-color:#ffc0c0"
|Mt||Meitnerium||Lise Meitner||109||&268[268]||9||7
|-style="background-color:#a0ffa0"
|N||Nitrogen||Greek nitron||7||&014.0067214.0067(2)||15||2
|-style="background-color:#ff6666"
|Na||Sodium||Latin natrium||11||&022.98976928222.98976928(2)||1||3
|-style="background-color:#ffc0c0"
|Nb||Niobium||Niobe||41||&092.90638292.906 38(2)||5||5
|-style="background-color:#ffbfff"
|Nd||Neodymium||Greek neos didymos||60||&144.2423144.242(3)|| ||6
|-style="background-color:#c0ffff"
|Ne||Neon||Greek neos||10||&020.1797620.1797(6)||18||2
|-style="background-color:#ffc0c0"
|Ni||Nickel||German kupfernickel||28||&058.6934258.6934(2)||10||4
|-style="background-color:#ff99cc"
|No||Nobelium||Alfred Nobel||102||&259[259]|| ||7
|-style="background-color:#ff99cc"
|Np||Neptunium||Neptune||93||&237[237]|| ||7
|-style="background-color:#a0ffa0"
|O||Oxygen||Greek oxys||8||&015.9994315.9994(3)||16||2
|-style="background-color:#ffc0c0"
|Os||Osmium||Greek osme||76||&190.233190.23(3)||8||6
|-style="background-color:#a0ffa0"
|P||Phosphorus||Greek phosphoros||15||&030.973762230.973762(2)||15||3
|-style="background-color:#ff99cc"
|Pa||Protactinium||Greek protos and actinium||91||&231.035882231.03588(2)|| ||7
|-style="background-color:#cccccc"
|Pb||Lead||Latin plumbum||82||&207.21207.2(1)||14||6
|-style="background-color:#ffc0c0"
|Pd||Palladium||Pallas (genitive Pallados)||46||&106.421106.42(1)||10||5
|-style="background-color:#ffbfff"
|Pm||Promethium||Prometheus||61||&145[145]|| ||6
|-style="background-color:#cccc99"
|Po||Polonium||Poland||84||&210[210]||16||6
|-style="background-color:#ffbfff"
|Pr||Praseodymium||Greek prasios||59||&140.907652140.90765(2)|| ||6
|-style="background-color:#ffc0c0"
|Pt||Platinum||Greek platina||78||&195.0849195.084(9)||10||6
|-style="background-color:#ff99cc"
|Pu||Plutonium||Pluto||94||&244[244]|| ||7
|-style="background-color:#ffdead"
|Ra||Radium||Latin radius||88||&226[226]||2||7
|-style="background-color:#ff6666"
|Rb||Rubidium||Latin rubidus||37||&085.4678385.4678(3)||1||5
|-style="background-color:#ffc0c0"
|Re||Rhenium||German Rheinprovinz||75||&186.2071186.207(1)||7||6
|-style="background-color:#ffc0c0"
|Rf||Rutherfordium||Ernest Rutherford||104||&261261||4||7
|-style="background-color:#ffc0c0"
|Rg||Roentgenium||Wilhelm Conrad Röntgen||111||&272[272]||11||7
|-style="background-color:#ffc0c0"
|Rh||Rhodium||Greek rhodon||45||&102.905502102.905 50(2)||9||5
|-style="background-color:#c0ffff"
|Rn||Radon||radium and emanation||86||&220[220]||18||6
|-style="background-color:#ffc0c0"
|Ru||Ruthenium||Latin Ruthenia||44||&101.072101.07(2)||8||5
|-style="background-color:#a0ffa0"
|S||Sulfur (Sulphur)||Latin sulfur||16||&032.065532.065(5)||16||3
|-style="background-color:#cccc99"
|Sb||Antimony||Latin stibium||51||&121.7601121.760(1)||15||5
|-style="background-color:#ffc0c0"
|Sc||Scandium||Scandinavia||21||&044.955912644.955912(6)||3||4
|-style="background-color:#a0ffa0"
|Se||Selenium||Greek selene||34||&078.96378.96(3)||16||4
|-style="background-color:#ffc0c0"
|Sg||Seaborgium||Glenn T. Seaborg||106||&266[266]||6||7
|-style="background-color:#cccc99"
|Si||Silicon||Latin silex||14||&028.0855328.0855(3)||14||3
|-style="background-color:#ffbfff"
|Sm||Samarium||samarskite||62||&150.362150.36(2)|| ||6
|-style="background-color:#cccccc"
|Sn||Tin||Latin stannum||50||&118.7101118.710(7)||14||5
|-style="background-color:#ffdead"
|Sr||Strontium||Gaelic Strontian||38||&087.62187.62(1)||2||5
|-style="background-color:#ffc0c0"
|Ta||Tantalum||King Tantalus||73||&180.947882180.94788(2)||5||6
|-style="background-color:#ffbfff"
|Tb||Terbium||Ytterby, Sweden||65||&158.925352158.92535(2)|| ||6
|-style="background-color:#ffc0c0"
|Tc||Technetium||Greek technetos''43&098[98]75TeTelluriumGreek tellus52&127.603127.60(3)165ThThoriumThor90&232.038062232.03806(2) 7TiTitaniumthe Titans22&047.867147.867(1)44TlThalliumGreek thallos81&204.38332204.3833(2)136TmThuliumThule and the traditional -ium ending69&168.934212168.93421(2) 6UUraniumUranus92&238.028913238.02891(3) 7UuhUnunhexiumLatin uni, uni, and Greek hex116&292[292]167UuoUnunoctiumLatin uni, uni, and oct118&294[294]187UupUnunpentiumLatin uni, uni, and Greek pent115&288[288]157UuqUnunquadiumLatin uni, uni, and quadr114&289[289]147UusUnunseptiumLatin uni, uni, and Greek sept117&295[295]177UutUnuntriumLatin uni, uni, and Greek tri113&284[284]137VVanadiumVanadis23&050.9415150.9415(1)54WTungstenGerman wolfram74&183.841183.84(1)66XeXenonGreek xenos54&131.2936131.293(6)185YYttriumYtterby, Sweden39&088.90585288.90585(2)35YbYtterbiumYtterby, Sweden70&173.043173.04(3) 6ZnZincGerman zink30&065.409465.409(4)124ZrZirconiumzircon40&091.224291.224(2)45

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