Nummer  Navn  Symbol  Masse
1  Hydrogen  H  1.007
2  Helium  He  4.002
3  Lithium  Li  6.941
4  Beryllium  Be  9.012
5  Boron  B  10.811
6  Carbon  C  12.011
7  Nitrogen  N  14.007
8  Oxygen  O  15.999
9  Fluorine  F  18.998
10  Neon  Ne  20.18
11  Sodium  Na  22.99
12  Magnesium  Mg  24.305
13  Aluminum  Al  26.982
14  Silicon  Si  28.086
15  Phosphorus  P  30.974
16  Sulfur  S  32.065
17  Chlorine  Cl  35.453
18  Argon  Ar  39.948
19  Potassium  K  39.098
20  Calcium  Ca  40.078
21  Scandium  Sc  44.956
22  Titanium  Ti  47.867
23  Vanadium  V  50.942
24  Chromium  Cr  51.996
25  Manganese  Mn  54.938
26  Iron  Fe  55.845
27  Cobalt  Co  58.933
28  Nickel  Ni  58.693
29  Copper  Cu  63.546
30  Zinc  Zn  65.38
31  Gallium  Ga  69.723
32  Germanium  Ge  72.64
33  Arsenic  As  74.922
34  Selenium  Se  78.96
35  Bromine  Br  79.904
36  Krypton  Kr  83.798
37  Rubidium  Rb  85.468
38  Strontium  Sr  87.62
39  Yttrium  Y  88.906
40  Zirconium  Zr  91.224
41  Niobium  Nb  92.906
42  Molybdenum  Mo  95.96
43  Technetium  Tc  98
44  Ruthenium  Ru  101.07
45  Rhodium  Rh  102.906
46  Palladium  Pd  106.42
47  Silver  Ag  107.868
48  Cadmium  Cd  112.411
49  Indium  In  114.818
50  Tin  Sn  118.71
51  Antimony  Sb  121.76
52  Tellurium  Te  127.6
53  Iodine  I  126.904
54  Xenon  Xe  131.293
55  Cesium  Cs  132.905
56  Barium  Ba  137.327
57  Lanthanum  La  138.905
58  Cerium  Ce  140.116
59  Praseodymium  Pr  140.908
60  Neodymium  Nd  144.242
61  Promethium  Pm  145
62  Samarium  Sm  150.36
63  Europium  Eu  151.964
64  Gadolinium  Gd  157.25
65  Terbium  Tb  158.925
66  Dysprosium  Dy  162.5
67  Holmium  Ho  164.93
68  Erbium  Er  167.259
69  Thulium  Tm  168.934
70  Ytterbium  Yb  173.054
71  Lutetium  Lu  174.967
72  Hafnium  Hf  178.49
73  Tantalum  Ta  180.948
74  Wolfram  W  183.84
75  Rhenium  Re  186.207
76  Osmium  Os  190.23
77  Iridium  Ir  192.217
78  Platinum  Pt  195.084
79  Gold  Au  196.967
80  Mercury  Hg  200.59
81  Thallium  Tl  204.383
82  Lead  Pb  207.2
83  Bismuth  Bi  208.98
84  Polonium  Po  210
85  Astatine  At  210
86  Radon  Rn  222
87  Francium  Fr  223
88  Radium  Ra  226
89  Actinium  Ac  227
90  Thorium  Th  232.038
91  Protactinium  Pa  231.036
92  Uranium  U  238.029
93  Neptunium  Np  237
94  Plutonium  Pu  244
95  Americium  Am  243
96  Curium  Cm  247
97  Berkelium  Bk  247
98  Californium  Cf  251
99  Einsteinium  Es  252
100  Fermium  Fm  257
101  Mendelevium  Md  258
102  Nobelium  No  259
103  Lawrencium  Lr  262
104  Rutherfordium  Rf  261
105  Dubnium  Db  262
106  Seaborgium  Sg  266
107  Bohrium  Bh  264
108  Hassium  Hs  267
109  Meitnerium  Mt  268
110  Darmstadtium   Ds   271
111  Roentgenium   Rg   272
112  Copernicium   Cn   285
113  Nihonium  Nh  284
114  Flerovium  Fl  289
115  Moscovium  Mc  288
116  Livermorium  Lv  292
117  Tennessine  Ts  295
118  Oganesson  Og  294