IA IIA IIIA IVA VA VIA VIIA VIII IB IIB IIIB IVB VB VIB VIIB 0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 1
Hydrogène
H
1.01
2
Hélium
He
4.00
2 3
Lithium
Li
6.94
4
Béryllium
Be
9.01
5
Bore
B
10.81
6
Carbone
C
12.01
7
Azote
N
14.01
8
Oxygène
O
16.00
9
Fluor
F
19.00
10
Néon
Ne
20.18
3 11
Sodium
Na
23.00
12
Magnésium
Mg
24.31
13
Aluminium
Al
26.98
14
Silicium
Si
28.09
15
Phosphore
P
30.97
16
Soufre
S
32.07
17
Chlore
Cl
35.45
18
Argon
Ar
39.95
4 19
Potassium
K
39.10
20
Calcium
Ca
40.08
21
Scandium
Sc
44.96
22
Titane
Ti
47.89
23
Vanadium
V
50.94
24
Chrome
Cr
52.00
25
Manganèse
Mn
54.94
26
Fer
Fe
55.85
27
Cobalt
Co
58.93
28
Nickel
Ni
58.69
29
Cuivre
Cu
63.55
30
Zinc
Zn
65.39
31
Gallium
Ga
69.72
32
Germanium
Ge
72.61
33
Arsenic
As
74.92
34
Sélénium
Se
78.96
35
Brome
Br
79.90
36
Krypton
Kr
83.80
5 37
Rubidium
Rb
85.48
38
Strontium
Sr
87.62
39
Yttrium
Y
88.91
40
Zirconium
Zr
91.22
41
Niobium
Nb
92.91
42
Molybdène
Mo
95.94
43
Technétium
Tc
[99]
44
Ruthénium
Ru
101.07
45
Rhodium
Rh
102.91
46
Palladium
Pd
106.42
47
Argent
Ag
107.87
48
Cadmium
Cd
112.41
49
Indium
In
114.82
50
Etain
Sn
118.71
51
Antimoine
Sb
121.76
52
Tellure
Te
127.60
53
Iode
I
126.90
54
Xénon
Xe
131.29
6 55
Césium
Cs
132.91
56
Baryum
Ba
137.33
57-71
Lanthanide
*
72
Hafnium
Hf
178.49
73
Tantale
Ta
180.95
74
Tungstène
W
183.84
75
Rhénium
Re
186.21
76
Osmium
Os
190.23
77
Iridium
Ir
192.22
78
Platine
Pt
195.08
79
Or
Au
196.97
80
Mercure
Hg
200.59
81
Thallium
Tl
204.38
82
Plomb
Pb
207.21
83
Bismuth
Bi
208.98
84
Polonium
Po
[210]
85
Astate
At
[210]
86
Radon
Rn
[222]
7 87
Francium
Fr
[223]
88
Radium
Ra
[226]
89-103
Actinide
**
104
Rutherfordium
Rf
[261]
105
Dubnium
Db
[262]
106
Seaborgium
Sg
[263]
107
Bohrium
Bh
[264]
108
Hassium
Hs
[269]
109
Meitnerium
Mt
[268]
110
Darmstadtium
Ds
[269]
111
Roentgenium
Rg
[272]

*
57
Lanthane
La
138.91
58
Cérium
Ce
140.12
59
Praséodyme
Pr
140.91
60
Néodyme
Nd
144.24
61
Prométhium
Pm
[145]
62
Samarium
Sm
150.36
63
Europium
Eu
151.97
64
Gadolinium
Gd
157.25
65
Terbium
Tb
158.93
66
Dysprosium
Dy
162.50
67
Holmium
Ho
164.93
68
Erbium
Er
167.26
69
Thulium
Tm
168.93
70
Ytterbium
Yb
173.04
71
Lutécium
Lu
174.97

**
89
Actinium
Ac
[227]
90
Thorium
Th
232.04
91
Protactinium
Pa
231.04
92
Uranium
U
238.03
93
Neptunium
Np
[237]
94
Plutonium
Pu
[239]
95
Américium
Am
[243]
96
Curium
Cm
[247]
97
Berkélium
Bk
[247]
98
Californium
Cf
[252]
99
Einsteinium
Es
[252]
100
Fermium
Fm
[257]
101
Mendélévium
Md
[256]
102
Nobélium
No
[259]
103
Lawrencium
Lr
[260]