| Masse atomique | Elément | Symbole | Numéro atomique |
| 1,0079 |
hydrogène |
H |
1 |
| 4,0026 |
hélium |
He |
2 |
| 6,941 |
lithium |
Li |
3 |
| 9,0122 |
bérryllium |
Be |
4 |
| 10,811 |
bore |
B |
5 |
| 12,0107 |
carbone |
C |
6 |
| 14,0067 |
azote |
N |
7 |
| 15,9994 |
oxygène |
O |
8 |
| 18,9984 |
fluor |
F |
9 |
| 20,1797 |
néon |
Ne |
10 |
| 22,9897 |
sodium |
Na |
11 |
| 24,305 |
magnésium |
Mg |
12 |
| 26,9815 |
aluminum |
Al |
13 |
| 28,0855 |
silicium |
Si |
14 |
| 30,9738 |
phosphore |
P |
15 |
| 32,065 |
soufre |
S |
16 |
| 35,453 |
chlore |
Cl |
17 |
| 39,0983 |
potassium |
K |
19 |
| 39,948 |
argon |
Ar |
18 |
| 40,078 |
calcium |
Ca |
20 |
| 44,9559 |
scandium |
Sc |
21 |
| 47,867 |
titane |
Ti |
22 |
| 50,9415 |
vanadium |
V |
23 |
| 51,9961 |
chrome |
Cr |
24 |
| 54,938 |
manganèse |
Mn |
25 |
| 55,845 |
fer |
Fe |
26 |
| 58,6934 |
nickel |
Ni |
28 |
| 58,9332 |
cobalt |
Co |
27 |
| 63,546 |
cuivre |
Cu |
29 |
| 65,39 |
zinc |
Zn |
30 |
| 69,723 |
gallium |
Ga |
31 |
| 72,64 |
germanium |
Ge |
32 |
| 74,9216 |
arsenic |
As |
33 |
| 78,96 |
sélénium |
Se |
34 |
| 79,904 |
brome |
Br |
35 |
| 83,8 |
krypton |
Kr |
36 |
| 85,4678 |
rubidium |
Rb |
37 |
| 87,62 |
strontium |
Sr |
38 |
| 88,9059 |
yttrium |
Y |
39 |
| 91,224 |
zirconium |
Zr |
40 |
| 92,9064 |
niobium |
Nb |
41 |
| 95,94 |
molybdène |
Mo |
42 |
| 101,07 |
ruthénium |
Ru |
44 |
| 102,9055 |
rhodium |
Rh |
45 |
| 106,42 |
palladium |
Pd |
46 |
| 107,8682 |
argent |
Ag |
47 |
| 112,411 |
cadmium |
Cd |
48 |
| 114,818 |
indium |
In |
49 |
| 118,71 |
étain |
Sn |
50 |
| 121,76 |
antimoine |
Sb |
51 |
| 126,9045 |
iode |
I |
53 |
| 127,6 |
tellure |
Te |
52 |
| 131,293 |
xénon |
Xe |
54 |
| 132,9055 |
césium |
Cs |
55 |
| 137,327 |
baryum |
Ba |
56 |
| 138,9055 |
lanthane |
La |
57 |
| 140,116 |
cérium |
Ce |
58 |
| 140,9077 |
praséodyme |
Pr |
59 |
| 144,24 |
néodyme |
Nd |
60 |
| 150,36 |
samarium |
Sm |
62 |
| 151,964 |
europium |
Eu |
63 |
| 157,25 |
gadolinium |
Gd |
64 |
| 158,9253 |
terbium |
Tb |
65 |
| 162,5 |
dysprosium |
Dy |
66 |
| 164,9303 |
holmium |
Ho |
67 |
| 167,259 |
erbium |
Er |
68 |
| 168,9342 |
thulium |
Tm |
69 |
| 173,04 |
ytterbium |
Yb |
70 |
| 174,967 |
lutétium |
Lu |
71 |
| 178,49 |
hafnium |
Hf |
72 |
| 180,9479 |
tantale |
Ta |
73 |
| 183,84 |
tungstène |
W |
74 |
| 186,207 |
rhénium |
Re |
75 |
| 190,23 |
osmium |
Os |
76 |
| 192,217 |
iridium |
Ir |
77 |
| 195,078 |
platine |
Pt |
78 |
| 196,9665 |
or |
Au |
79 |
| 200,59 |
mercure |
Hg |
80 |
| 204,3833 |
thallium |
Tl |
81 |
| 207,2 |
plomb |
Pb |
82 |
| 208,9804 |
bismuth |
Bi |
83 |