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Periodic Table of elements
Symbol Name Etymology of symbol Atomic number Relative atomic mass Group Period
Ac Actinium from Greek aktinos 89 &227[227][1]   7
Ag Silver Latin argentum 47 &107.86822107.8682(2)[2] 11 5
Al Aluminium (Aluminum) Latin alumen 13 &026.9815386826.9815386(8) 13 3
Am Americium the Americas 95 &243[243][1]   7
Ar Argon Greek argon 18 &039.948139.948(1)[2][3] 18 3
As Arsenic Greek arsenikos 33 &074.92160274.92160(2) 15 4
At Astatine Greek astatos 85 &210[210][1] 17 6
Au Gold Latin aurum 79 &196.9665694196.966569(4) 11 6
B Boron borax 5 &010.811710.811(7)[2][3][4] 13 2
Ba Barium Greek barys 56 &137.3277137.327(7) 2 6
Be Beryllium beryl 4 &009.01218239.012182(3) 2 2
Bh Bohrium Niels Bohr 107 &264[264][1] 7 7
Bi Bismuth from German wissmuth 83 &208.980401208.98040(1) 15 6
Bk Berkelium Berkeley, California 97 &247[247][1]   7
Br Bromine Greek bromos 35 &079.904179.904(1) 17 4
C Carbon Latin carbo 6 &012.0107812.0107(8)[2][3] 14 2
Ca Calcium Latin calx 20 &040.078440.078(4)[2] 2 4
Cd Cadmium from Greek kadmia 48 &112.4118112.411(8)[2] 12 5
Ce Cerium Ceres 58 &140.1161140.116(1)[2]   6
Cf Californium State and University of California 98 &251[251][1]   7
Cl Chlorine Greek chloros 17 &035.453235.453(2)[2][3][4] 17 3
Cm Curium Pierre and Marie Curie and the traditional -um ending 96 &247[247][1]   7
Cn Copernicium Nicolaus Copernicus 112 &285[285][1] 12 7
Co Cobalt from German kobold 27 &058.933195558.933195(5) 9 4
Cr Chromium Greek chroma 24 &051.9961651.9961(6) 6 4
Cs Caesium (Cesium) Latin caesius 55 &132.90545192132.9054519(2) 1 6
Cu Copper Latin Cuprum 29 &063.546363.546(3)[3] 11 4
Db Dubnium Dubna, Russia 105 &262[262][1] 5 7
Ds Darmstadtium Darmstadt, Germany 110 &271[271][1] 10 7
Dy Dysprosium Greek dysprositos 66 &162.5001162.500(1)[2]   6
Er Erbium Ytterby, Sweden 68 &167.2593167.259(3)[2]   6
Es Einsteinium Albert Einstein 99 &252[252][1]   7
Eu Europium Europe 63 &151.9641151.964(1)[2]   6
F Fluorine Latin fluo 9 &018.9984032518.9984032(5) 17 2
Fe Iron Latin ferrum 26 &055.845255.845(2) 8 4
Fm Fermium Enrico Fermi 100 &257[257][1]   7
Fr Francium France 87 &223[223][1] 1 7
Ga Gallium Latin Gallia 31 &069.723169.723(1) 13 4
Gd Gadolinium gadolinite 64 &157.253157.25(3)[2]   6
Ge Germanium Germany 32 &072.64172.64(1) 14 4
H Hydrogen Greek hydrogenes 1 &001.0079471.00794(7)[2][3][4] 1 1
He Helium Greek helios 2 &004.00260224.002602(2)[2][3] 18 1
Hf Hafnium Latin Hafnia 72 &178.492178.49(2) 4 6
Hg Mercury Latin hydrargyrum 80 &200.592200.59(2) 12 6
Ho Holmium Latin Holmia 67 &164.930322164.930 32(2)   6
Hs Hassium Hesse, Germany 108 &277[277][1] 8 7
I Iodine Greek ioeides 53 &126.904473126.904 47(3) 17 5
In Indium indigo blue 49 &114.8183114.818(3) 13 5
Ir Iridium Greek iris 77 &192.2173192.217(3) 9 6
K Potassium (Kalium) Latin kalium 19 &039.0983139.0983(1) 1 4
Kr Krypton Greek kryptos 36 &083.798283.798(2)[2][4] 18 4
La Lanthanum Greek lanthanien 57 &138.905477138.90547(7)[2]   6
Li Lithium Greek lithos 3 &006.94126.941(2)[2][3][4][5] 1 2
Lr Lawrencium Ernest O. Lawrence 103 &262[262][1] 3 7
Lu Lutetium Latin Lutetia 71 &174.9671174.967(1)[2] 3 6
Md Mendelevium Dmitri Mendeleyev 101 &258[258][1]   7
Mg Magnesium Magnesia, Greece 12 &024.3050624.3050(6) 2 3
Mn Manganese Latin magnes 25 &054.938045554.938045(5) 7 4
Mo Molybdenum Greek molybdos 42 &095.94295.94(2)[2] 6 5
Mt Meitnerium Lise Meitner 109 &268[268][1] 9 7
N Nitrogen Greek nitron 7 &014.0067214.0067(2)[2][3] 15 2
Na Sodium Latin natrium 11 &022.98976928222.98976928(2) 1 3
Nb Niobium Niobe 41 &092.90638292.906 38(2) 5 5
Nd Neodymium Greek neos didymos 60 &144.2423144.242(3)[2]   6
Ne Neon Greek neos 10 &020.1797620.1797(6)[2][4] 18 2
Ni Nickel German kupfernickel 28 &058.6934258.6934(2) 10 4
No Nobelium Alfred Nobel 102 &259[259][1]   7
Np Neptunium Neptune 93 &237[237][1]   7
O Oxygen Greek oxys 8 &015.9994315.9994(3)[2][3] 16 2
Os Osmium Greek osme 76 &190.233190.23(3)[2] 8 6
P Phosphorus Greek phosphoros 15 &030.973762230.973762(2) 15 3
Pa Protactinium Greek protos and actinium 91 &231.035882231.03588(2)[1]   7
Pb Lead Latin plumbum 82 &207.21207.2(1)[2][3] 14 6
Pd Palladium Pallas (genitive Pallados) 46 &106.421106.42(1)[2] 10 5
Pm Promethium Prometheus 61 &145[145][1]   6
Po Polonium Poland 84 &210[210][1] 16 6
Pr Praseodymium Greek prasios 59 &140.907652140.90765(2)   6
Pt Platinum Greek platina 78 &195.0849195.084(9) 10 6
Pu Plutonium Pluto 94 &244[244][1]   7
Ra Radium Latin radius 88 &226[226][1] 2 7
Rb Rubidium Latin rubidus 37 &085.4678385.4678(3)[2] 1 5
Re Rhenium German Rheinprovinz 75 &186.2071186.207(1) 7 6
Rf Rutherfordium Ernest Rutherford 104 &261261[1] 4 7
Rg Roentgenium Wilhelm Conrad Röntgen 111 &272[272][1] 11 7
Rh Rhodium Greek rhodon 45 &102.905502102.905 50(2) 9 5
Rn Radon radium and emanation 86 &220[220][1] 18 6
Ru Ruthenium Latin Ruthenia 44 &101.072101.07(2)[2] 8 5
S Sulfur (Sulphur) Latin sulfur 16 &032.065532.065(5)[2][3] 16 3
Sb Antimony Latin stibium 51 &121.7601121.760(1)[2] 15 5
Sc Scandium Scandinavia 21 &044.955912644.955912(6) 3 4
Se Selenium Greek selene 34 &078.96378.96(3)[3] 16 4
Sg Seaborgium Glenn T. Seaborg 106 &266[266][1] 6 7
Si Silicon Latin silex 14 &028.0855328.0855(3)[3] 14 3
Sm Samarium samarskite 62 &150.362150.36(2)[2]   6
Sn Tin Latin stannum 50 &118.7101118.710(7)[2] 14 5
Sr Strontium Gaelic Strontian 38 &087.62187.62(1)[2][3] 2 5
Ta Tantalum King Tantalus 73 &180.947882180.94788(2) 5 6
Tb Terbium Ytterby, Sweden 65 &158.925352158.92535(2)   6
Tc Technetium Greek technetos 43 &098[98][1] 7 5
Te Tellurium Greek tellus 52 &127.603127.60(3)[2] 16 5
Th Thorium Thor 90 &232.038062232.03806(2)[1][2]   7
Ti Titanium the Titans 22 &047.867147.867(1) 4 4
Tl Thallium Greek thallos 81 &204.38332204.3833(2) 13 6
Tm Thulium Thule and the traditional -ium ending 69 &168.934212168.93421(2)   6
U Uranium Uranus 92 &238.028913238.02891(3)[1][2][4]   7
Uuh Ununhexium Latin uni, uni, and Greek hex 116 &292[292][1] 16 7
Uuo Ununoctium Latin uni, uni, and oct 118 &294[294][1] 18 7
Uup Ununpentium Latin uni, uni, and Greek pent 115 &288[288][1] 15 7
Uuq Ununquadium Latin uni, uni, and quadr 114 &289[289][1] 14 7
Uus Ununseptium Latin uni, uni, and Greek sept 117 &295[295][1] 17 7
Uut Ununtrium Latin uni, uni, and Greek tri 113 &284[284][1] 13 7
V Vanadium Vanadis 23 &050.9415150.9415(1) 5 4
W Tungsten German wolfram 74 &183.841183.84(1) 6 6
Xe Xenon Greek xenos 54 &131.2936131.293(6)[2][4] 18 5
Y Yttrium Ytterby, Sweden 39 &088.90585288.90585(2) 3 5
Yb Ytterbium Ytterby, Sweden 70 &173.043173.04(3)[2]   6
Zn Zinc German zink 30 &065.409465.409(4) 12 4
Zr Zirconium zircon 40 &091.224291.224(2)[2] 4 5


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 1.28 1.29 1.30 1.31 1.32 1.33 1.34 1.35 1.36 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.
  2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.37 2.38 The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.
  3. 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.
  5. 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.