1 H Hydrogen 1.00794 1 2 He Helium 4.002602 2 3 Li Lithium 6.941 2 1 4 Be Beryllium 9.012182 2 2 5 B Boron 10.811 2 3 6 C Carbon 12.0107 2 4 7 N Nitrogen 14.0067 2 5 8 O Oxygen 15.9994 2 6 9 F Fluorine 18.9984032 2 7 10 Ne Neon 20.1797 2 8 11 Na Sodium 22.98976928 2 8 1 12 Mg Magnesium 24.3050 2 8 2 13 Al Aluminum 26.9815386 2 8 3 14 Si Silicon 28.0855 2 8 4 15 P Phosphorus 30.973762 2 8 5 16 S Sulfur 32.065 2 8 6 17 Cl Chlorine 35.453 2 8 7 18 Ar Argon 39.948 2 8 8 19 K Potassium 39.0983 2 8 8 1 20 Ca Calcium 40.078 2 8 8 2 21 Sc Scandium 44.955912 2 8 9 2 22 Ti Titanium 47.867 2 8 10 2 23 V Vanadium 50.9415 2 8 11 2 24 Cr Chromium 51.9961 2 8 13 1 25 Mn Manganese 54.938045 2 8 13 2 26 Fe Iron 55.845 2 8 14 2 27 Co Cobalt 58.933195 2 8 15 2 28 Ni Nickel 58.6934 2 8 16 2 29 Cu Copper 63.546 2 8 18 1 30 Zn Zinc 65.38 2 8 18 2 31 Ga Gallium 69.723 2 8 18 3 32 Ge Germanium 72.64 2 8 18 4 33 As Arsenic 74.92160 2 8 18 5 34 Se Selenium 78.96 2 8 18 6 35 Br Bromine 79.904 2 8 18 7 36 Kr Krypton 83.798 2 8 18 8 37 Rb Rubidium 85.4678 2 8 18 8 1 38 Sr Strontium 87.62 2 8 18 8 2 39 Y Yttrium 88.90585 2 8 18 9 2 40 Zr Zirconium 91.224 2 8 18 10 2 41 Nb Niobium 92.90638 2 8 18 12 1 42 Mo Molybdenum 95.96 2 8 18 13 1 43 Tc Technetium 97.9072 2 8 18 14 1 44 Ru Ruthenium 101.07 2 8 18 15 1 45 Rh Rhodium 102.90550 2 8 18 16 1 46 Pd Palladium 106.42 2 8 18 18 0 47 Ag Silver 107.8682 2 8 18 18 1 48 Cd Cadmium 112.411 2 8 18 18 2 49 In Indium 114.818 2 8 18 18 3 50 Sn Tin 118.710 2 8 18 18 4 51 Sb Antimony 121.760 2 8 18 18 5 52 Te Tellurium 121.760 2 8 18 18 6 53 I Iodine 126.90447 2 8 18 18 7 54 Xe Xenon 131.293 2 8 18 18 8 55 Cs Caesium 132.9054519 2 8 18 18 8

56 Ba Barium 137.327 2 8 18 18 8

72 Hf Hafnium 178.49 2 8 18 32 10

73 Ta Tantalum 180.94788 2 8 18 32 11

74 W Tungsten 183.84 2 8 18 32 12

75 Re Rhenium 186.207 2 8 18 32 13

76 Os Osmium 190.23 2 8 18 32 14

77 Ir Iridium 192.217 2 8 18 32 15

78 Pt Platinum 195.084 2 8 18 32 17

79 Au Gold 196.966569 2 8 18 32 18

80 Hg Mercury 200.59 2 8 18 32 18

81 Tl Thallium 204.3833 2 8 18 32 18

82 Pb Lead 207.2 2 8 18 32 18

83 Bi Bismuth 208.98040 2 8 18 32 18

84 Po Polonium 208.9824 2 8 18 32 18

85 At Astatine 209.9871 2 8 18 32 18

86 Rn Radon 222.0176 2 8 18 32 18

87 Fr Francium 223 2 8 18 32 18

1 88 Ra Radium 226 2 8 18 32 18

2 104 Rf Rutherfordium 261 2 8 18 32 32

2 105 Db Dubnium 262 2 8 18 32 32

2 106 Sg Seaborgium 266 2 8 18 32 32

2 107 Bh Bohrium 264 2 8 18 32 32

2 108 Hs Hassium 277 2 8 18 32 32

2 109 Mt Meitnerium 268 2 8 18 32 32

2 110 Ds Darmstadtium 271 2 8 18 32 32

1 111 Rg Roentgenium 272 2 8 18 32 32

1 112 Cn Copernicium 285 2 8 18 32 32

2 113 Uut Ununtrium 284 2 8 18 32 32

3 114 Fl Flerovium 289 2 8 18 32 32

4 115 Uup Ununpentium 288 2 8 18 32 32

5 116 Lv Livermorium 292 2 8 18 32 32

6 117 Uus Ununseptium 294 2 8 18 32 32

7 118 Uuo Ununoctium 294 2 8 18 32 32

8 57 La Lanthanum 138.90547 2 8 18 18 9

58 Ce Cerium 140.116 2 8 18 19 9

59 Pr Praseodymium 140.90765 2 8 18 21 8

60 Nd Neodymium 144.242 2 8 18 22 8

61 Pm Promethium 145 2 8 18 23 8

62 Sm Samarium 150.36 2 8 18 24 8

63 Eu Europium 151.964 2 8 18 25 8

64 Gd Gadolinium 157.25 2 8 18 25 9

65 Tb Terbium 158.92535 2 8 18 27 8

66 Dy Dysprosium 162.500 2 8 18 28 8

67 Ho Holmium 164.93032 2 8 18 29 8

68 Er Erbium 167.259 2 8 18 30 8

69 Tm Thulium 168.93421 2 8 18 31 8

70 Yb Ytterbium 173.054 2 8 18 32 8

71 Lu Lutetium 174.9668 2 8 18 32 9

89 Ac Actinium 227 2 8 18 32 18

2 90 Th Thorium 232.03806 2 8 18 32 18

2 91 Pa Protactinium 231.03588 2 8 18 32 20

2 92 U Uranium 238.02891 2 8 18 32 21

2 93 Np Neptunium 237 2 8 18 32 22

2 94 Pu Plutonium 244 2 8 18 32 24

2 95 Am Americium 243 2 8 18 32 25

2 96 Cm Curium 247 2 8 18 32 25

2 97 Bk Berkelium 247 2 8 18 32 27

2 98 Cf Californium 251 2 8 18 32 28

2 99 Es Einsteinium 252 2 8 18 32 29

2 100 Fm Fermium 257 2 8 18 32 30

2 101 Md Mendelevium 258 2 8 18 32 31

2 102 No Nobelium 259 2 8 18 32 32

2 103 Lr Lawrencium 262 2 8 18 32 32