H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr ALPHABETIC LIST BY SYMBOL Z RAM* Ac Actinium 89 Ag Silver 47 107.87 Al Aluminium 13 26.98 Am Americium 95 Ar Argon 18 39.95 As Arsenic 33 74.92 At Astatine 85 Au Gold 79 196.97 B Boron 5 10.81 Ba Barium 56 137.33 Be Beryllium 4 9.01 Bh Bohrium 107 Bi Bismuth 83 208.98 Bk Berkelium 97 Br Bromine 35 79.90 C Carbon 6 12.01 Ca Calcium 20 40.08 Cd Cadmium 48 112.41 Ce Cerium 58 140.12 Cf Californium 98 Cl Chlorine 17 35.45 Cm Curium 96 Cn Copernicium 112 Co Cobalt 27 58.93 Cr Chromium 24 52.00 Cs Caesium 55 132.91 Cu Copper 29 63.55 Db Dubnium 105 Ds Darmstadtium 110 Dy Dysprosium 66 162.50 Er Erbium 68 167.26 Es Einsteinium 99 Eu Europium 63 F Fluorine 9 19.00 Fe Iron 26 55.85 Fl Flerovium 114 Fm Fermium 100 Fr Francium 87 Ga Gallium 31 69.72 Gd Gadolinium 64 157.25 Ge Germanium 32 72.63 H Hydrogen 1 1.008 He Helium 2 4.003 Hf Hafnium 72 178.49 Hg Mercury 80 200.59 Ho Holmium 67 164.93 Hs Hassium 108 I Iodine 53 126.90 In Indium 49 114.82 Ir Iridium 77 192.22 K Potassium 19 39.10 Kr Krypton 36 83.80 La Lanthanum 57 138.91 Li Lithium 3 6.94 Lr Lawrencium 103 Lu Lutetium 71 174.97 Lv Livermorium 116 Mc Moscovium 115 Md Mendeleevium 101 Mg Magnesium 12 24.31 Mn Manganese 25 54.94 Mo Molybdenum 42 95.95 Mt Meitnerium 109 N Nitrogen 7 14.01 Na Sodium 11 22.99 Nb Niobium 41 92.91 Nd Neodymium 60 114.24 Ne Neon 10 20.18 Nh Nihonium 113 Ni Nickel 28 58.69 No Nobelium 102 Np Neptunium 93 O Oxygen 8 16.00 Og Oganesson 118 Os Osmium 76 190.23 P Phosphorus 15 30.97 Pa Protactinium 91 Pb Lead 82 207.2 Pd Palladium 46 106.42 Pm Promethium 61 Po Polonium 84 Pr Praseodymium 59 140.91 Pt Platinum 78 195.08 Pu Plutonium 94 Ra Radium 88 Rb Rubidium 37 85.47 Re Rhenium 75 186.21 Rf Rutherfordium 104 Rg Roentgenium 111 Rh Rhodium 45 102.91 Rn Radon 86 Ru Ruthenium 44 101.07 S Sulphur 16 32.06 Sb Antimony 51 121.76 Sc Scandium 21 44.96 Se Selenium 34 78.97 Sg Seaborgium 106 Si Silicon 14 28.09 Sm Samarium 62 150.36 Sn Tin 50 118.71 Sr Strontium 38 87.62 Ta Tantalum 73 180.95 Tb Terbium 65 158.93 Tc Technetium 43 Te Tellurium 52 127.60 Th Thorium 90 232.04 Ti Titanium 22 47.87 Tl Thallium 81 204.38 Tm Thulium 69 168.93 Ts Tennessine 117 U Uranium 92 238.03 V Vanadium 23 50.94 W Tungsten 74 183.84 Xe Xenon 54 131.29 Y Yttrium 39 88.91 Yb Ytterbium 70 173.05 Zn Zinc 30 65.38 Zr Zirconium 40 91.22 * Relative atomic masses are given to two decimal places except for hydrogen and helium, where this would lead to an unsuitably low precision, and for lead, where the isotopic composition of samples varies so much that two decimal places is inappropriate. RAMs are omitted for elements which do not occur naturally (such as plutonium), or which occur naturally only as a temporary part of a decay chain (such as radium).