1 H Hydrogen 1.008 1 1
2 He Helium 4.002602 1 18
3 Li Lithium 6.94 2 1
4 Be Beryllium 9.0121831 2 2
5 B Boron 10.81 2 13
6 C Carbon 12.011 2 14
7 N Nitrogen 14.007 2 15
8 O Oxygen 15.999 2 16
9 F Fluorine 18.998403163 2 17
10 Ne Neon 20.1797 2 18
11 Na Sodium 22.98976928 3 1
12 Mg Magnesium 24.305 3 2
13 Al Aluminium 26.9815385 3 13
14 Si Silicon 28.085 3 14
15 P Phosphorus 30.973761998 3 15
16 S Sulfur 32.06 3 16
17 Cl Chlorine 35.45 3 17
18 Ar Argon 39.948 3 18
19 K Potassium 39.0983 4 1
20 Ca Calcium 40.078 4 2
21 Sc Scandium 44.955908 4 3
22 Ti Titanium 47.867 4 4
23 V Vanadium 50.9415 4 5
24 Cr Chromium 51.9961 4 6
25 Mn Manganese 54.938044 4 7
26 Fe Iron 55.845 4 8
27 Co Cobalt 58.933194 4 9
28 Ni Nickel 58.6934 4 10
29 Cu Copper 63.546 4 11
30 Zn Zinc 65.38 4 12
31 Ga Gallium 69.723 4 13
32 Ge Germanium 72.63 4 14
33 As Arsenic 74.921595 4 15
34 Se Selenium 78.971 4 16
35 Br Bromine 79.904 4 17
36 Kr Krypton 83.798 4 18
37 Rb Rubidium 85.4678 5 1
38 Sr Strontium 87.62 5 2
39 Y Yttrium 88.90584 5 3
40 Zr Zirconium 91.224 5 4
41 Nb Niobium 92.90637 5 5
42 Mo Molybdenum 95.95 5 6
43 Tc Technetium 98 5 7
44 Ru Ruthenium 101.07 5 8
45 Rh Rhodium 102.9055 5 9
46 Pd Palladium 106.42 5 10
47 Ag Silver 107.8682 5 11
48 Cd Cadmium 112.414 5 12
49 In Indium 114.818 5 13
50 Sn Tin 118.71 5 14
51 Sb Antimony 121.76 5 15
52 Te Tellurium 127.6 5 16
53 I Iodine 126.90447 5 17
54 Xe Xenon 131.293 5 18
55 Cs Caesium 132.90545196 6 1
56 Ba Barium 137.327 6 2
57 La Lanthanum 138.90547 6 0
58 Ce Cerium 140.116 6 0
59 Pr Praseodymium 140.90766 6 0
60 Nd Neodymium 144.242 6 0
61 Pm Promethium 145 6 0
62 Sm Samarium 150.36 6 0
63 Eu Europium 151.964 6 0
64 Gd Gadolinium 157.25 6 0
65 Tb Terbium 158.92535 6 0
66 Dy Dysprosium 162.5 6 0
67 Ho Holmium 164.93033 6 0
68 Er Erbium 167.259 6 0
69 Tm Thulium 168.93422 6 0
70 Yb Ytterbium 173.045 6 0
71 Lu Lutetium 174.9668 6 3
72 Hf Hafnium 178.49 6 4
73 Ta Tantalum 180.94788 6 5
74 W Tungsten 183.84 6 6
75 Re Rhenium 186.207 6 7
76 Os Osmium 190.23 6 8
77 Ir Iridium 192.217 6 9
78 Pt Platinum 195.084 6 10
79 Au Gold 196.966569 6 11
80 Hg Mercury 200.592 6 12
81 Tl Thallium 204.38 6 13
82 Pb Lead 207.2 6 14
83 Bi Bismuth 208.9804 6 15
84 Po Polonium 209 6 16
85 At Astatine 210 6 17
86 Rn Radon 222 6 18
87 Fr Francium 223 7 1
88 Ra Radium 226 7 2
89 Ac Actinium 227 7 0
90 Th Thorium 232.0377 7 0
91 Pa Protactinium 231.03588 7 0
92 U Uranium 238.02891 7 0
93 Np Neptunium 237 7 0
94 Pu Plutonium 244 7 0
95 Am Americium 243 7 0
96 Cm Curium 247 7 0
97 Bk Berkelium 247 7 0
98 Cf Californium 251 7 0
99 Es Einsteinium 252 7 0
100 Fm Fermium 257 7 0
101 Md Mendelevium 258 7 0
102 No Nobelium 259 7 0
103 Lr Lawrencium 266 7 3
104 Rf Rutherfordium 267 7 4
105 Db Dubnium 268 7 5
106 Sg Seaborgium 269 7 6
107 Bh Bohrium 270 7 7
108 Hs Hassium 269 7 8
109 Mt Meitnerium 278 7 9
110 Ds Darmstadtium 281 7 10
111 Rg Roentgenium 282 7 11
112 Cn Copernicium 285 7 12
113 Nh Nihonium 286 7 13
114 Fl Flerovium 289 7 14
115 Mc Moscovium 290 7 15
116 Lv Livermorium 293 7 16
117 Ts Tennessine 294 7 17
118 Og Oganesson 294 7 18