|
Numéro atomique
|
Masse atomique
|
Nom de l’élément
|
|
1
|
1,01
|
Hydrogène
|
|
2
|
4,00
|
Hélium
|
|
3
|
6,94
|
Lithium
|
|
4
|
9,01
|
Béryllium
|
|
5
|
10,81
|
Bore
|
|
6
|
12,01
|
Carbone
|
|
7
|
14,01
|
Azote
|
|
8
|
16,00
|
Oxygène
|
|
9
|
19,00
|
Fluor
|
|
10
|
20,18
|
Néon
|
|
11
|
22,99
|
Sodium
|
|
12
|
24,31
|
Magnésium
|
|
13
|
26,98
|
Aluminium
|
|
14
|
28,09
|
Silicium
|
|
15
|
30,97
|
Phosphore
|
|
16
|
32,07
|
Soufre
|
|
17
|
35,45
|
Chlore
|
|
18
|
39,95
|
Argon
|
|
19
|
39,10
|
Potassium
|
|
20
|
40,08
|
Calcium
|
|
21
|
44,96
|
Scandium
|
|
22
|
47,90
|
Titane
|
|
23
|
50,93
|
Vanadium
|
|
24
|
52,00
|
Chrome
|
|
25
|
54,94
|
Manganèse
|
|
26
|
55,85
|
Fer
|
|
27
|
58,93
|
Cobalt
|
|
28
|
58,71
|
Nickel
|
|
29
|
63,55
|
Cuivre
|
|
30
|
65,39
|
Zinc
|
|
31
|
69,72
|
Gallium
|
|
32
|
72,59
|
Germanium
|
|
33
|
74,92
|
Arsenic
|
|
34
|
78,96
|
Sélénium
|
|
35
|
79,90
|
Brome
|
|
36
|
83,80
|
Krypton
|
|
37
|
85,47
|
Rubidium
|
|
38
|
87,62
|
Strontium
|
|
39
|
88,91
|
Yttrium
|
|
40
|
91,22
|
Zirconium
|
|
41
|
92,91
|
Niobium
|
|
42
|
95,94
|
Molybdène
|
|
43
|
98,91
|
Technétium
|
|
44
|
101,07
|
Ruthénium
|
|
45
|
102,91
|
Rhodium
|
|
46
|
106,40
|
Palladium
|
|
47
|
107,87
|
Argent
|
|
48
|
112,41
|
Cadmium
|
|
49
|
114,82
|
Indium
|
|
50
|
118,71
|
Étain
|
|
51
|
121,75
|
Antimoine
|
|
52
|
127,60
|
Tellure
|
|
53
|
126,90
|
Iode
|
|
54
|
131,30
|
Xénon
|
|
55
|
132,91
|
|
56
|
137,33
|
Baryum
|
|
57
|
138,91
|
Lanthane
|
|
58
|
140,12
|
Cérium
|
|
59
|
140,91
|
Praséodyme
|
|
|
Numéro atomique
|
Masse atomique
|
Nom de l’élément
|
|
60
|
144,24
|
Néodyme
|
|
61
|
(145)
|
Prométhium
|
|
62
|
150,36
|
Samarium
|
|
63
|
151,96
|
Europium
|
|
64
|
157,25
|
Gadolinium
|
|
65
|
158,93
|
Terbium
|
|
66
|
162,50
|
Dysprosium
|
|
67
|
164,93
|
Holmium
|
|
68
|
167,26
|
Erbium
|
|
69
|
168,93
|
Thulium
|
|
70
|
173,05
|
Ytterbium
|
|
71
|
174,97
|
Lutécium
|
|
72
|
178,49
|
Hafnium
|
|
73
|
180,95
|
Tantale
|
|
74
|
183,85
|
Tungstène
|
|
75
|
186,21
|
Rhénium
|
|
76
|
190,20
|
Osmium
|
|
77
|
193,22
|
Iridium
|
|
78
|
195,09
|
Platine
|
|
79
|
196,97
|
Or
|
|
80
|
200,59
|
Mercure
|
|
81
|
204,37
|
Thallium
|
|
82
|
207,20
|
Plomb
|
|
83
|
208,98
|
Bismuth
|
|
84
|
(209)
|
Polonium
|
|
85
|
(210)
|
Astate
|
|
86
|
(222)
|
Radon
|
|
87
|
(223)
|
Francium
|
|
88
|
(226)
|
Radium
|
|
89
|
(227)
|
Actinium
|
|
90
|
232,04
|
Thorium
|
|
91
|
231,04
|
Protactinium
|
|
92
|
238,03
|
Uranium
|
|
93
|
(237)
|
Neptunium
|
|
94
|
(244)
|
Plutonium
|
|
95
|
(243)
|
Américium
|
|
96
|
(247)
|
Curium
|
|
97
|
(247)
|
Berkélium
|
|
98
|
(251)
|
Californium
|
|
99
|
(252)
|
Einsteinium
|
|
100
|
(257)
|
Fermium
|
|
101
|
(258)
|
Mendélévium
|
|
102
|
(259)
|
Nobélium
|
|
103
|
(262)
|
Lawrencium
|
|
104
|
(267)
|
Rutherfordium
|
|
105
|
(268)
|
Dubnium
|
|
106
|
(271)
|
Seaborgium
|
|
107
|
(272)
|
Bohrium
|
|
108
|
(270)
|
Hassium
|
|
109
|
(276)
|
Meitnerium
|
|
110
|
(281)
|
Darmstadtium
|
|
111
|
(280)
|
Roentgenium
|
|
112
|
(285)
|
Copernicium
|
|
113
|
(284)
|
Nihonium
|
|
114
|
(289)
|
Flérovium
|
|
115
|
(288)
|
Moscovium
|
|
116
|
(293)
|
Livermorium
|
|
117
|
(292)
|
Tennesse
|
|
118
|
(294)
|
Oganesson
|
|