NUMERO
ATOMICO
|
ELEMENTO
(NOME)
|
ELEMENTO
(SIMBOLO)
|
MASSA ATOMICA (uma)*
|
|
1
|
Idrogeno
|
H
|
1,0079
|
|
2
|
Elio
|
He
|
4,0026
|
|
3
|
Litio
|
Li
|
6,941
|
|
4
|
Berillio
|
Be
|
9,0122
|
|
5
|
Boro
|
B
|
10,81
|
|
6
|
Carbonio
|
C
|
12,011
|
|
7
|
Azoto
|
N
|
14,0067
|
|
8
|
Ossigeno
|
O
|
15,9994
|
|
9
|
Fluoro
|
F
|
18,9984
|
|
10
|
Neon
|
Ne
|
20,1798
|
|
11
|
Sodio
|
Na
|
22,9898
|
|
12
|
Magnesio
|
Mg
|
24,3051
|
|
13
|
Alluminio
|
Al
|
26,9815
|
|
14
|
Silicio
|
Si
|
28,0855
|
|
15
|
Fosforo
|
P
|
30,9738
|
|
16
|
Zolfo
|
S
|
32,067
|
|
17
|
Cloro
|
Cl
|
35,4528
|
|
18
|
Argon
|
Ar
|
39,948
|
|
19
|
Potassio
|
K
|
39,0983
|
|
20
|
Calcio
|
Ca
|
40,078
|
|
21
|
Scandio
|
Sc
|
44,9559
|
|
22
|
Titanio
|
Ti
|
47,867
|
|
23
|
Vanadio
|
V
|
50,9415
|
|
24
|
Cromo
|
Cr
|
51,9962
|
|
25
|
Manganese
|
Mn
|
54,938
|
|
26
|
Ferro
|
Fe
|
55,845
|
|
27
|
Cobalto
|
Co
|
58,9332
|
|
28
|
Nichel
|
Ni
|
58,6934
|
|
29
|
Rame
|
Cu
|
63,546
|
|
30
|
Zinco
|
Zn
|
65,409
|
|
31
|
Gallio
|
Ga
|
69,723
|
|
32
|
Germanio
|
Ge
|
72,61
|
|
33
|
Arsenico
|
As
|
74,9216
|
|
34
|
Selenio
|
Se
|
78,96
|
|
35
|
Bromo
|
Br
|
79,904
|
|
36
|
Cripto
|
Kr
|
83,798
|
|
37
|
Rubidio
|
Rb
|
85,4678
|
|
38
|
Stronzio
|
Sr
|
87,62
|
|
39
|
Ittrio
|
Y
|
88,906
|
|
40
|
Zirconio
|
Zr
|
91,224
|
|
41
|
Niobio
|
Nb
|
92,9064
|
|
42
|
Molibdeno
|
Mo
|
95,94
|
|
43
|
Tecnezio
|
Tc
|
98
|
|
44
|
Rutenio
|
Ru
|
101,07
|
|
45
|
Rodio
|
Rh
|
102,9055
|
|
46
|
Palladio
|
Pd
|
106,42
|
|
47
|
Argento
|
Ag
|
107,8682
|
|
48
|
Cadmio
|
Cd
|
112,412
|
|
49
|
Indio
|
In
|
114,818
|
|
50
|
Stagno
|
Sn
|
118,711
|
|
51
|
Antimonio
|
Sb
|
121,760
|
|
52
|
Tellurio
|
Te
|
127,60
|
|
53
|
Iodio
|
I
|
126,9045
|
|
54
|
Xeno
|
Xe
|
131,29
|
|
55
|
Cesio
|
Cs
|
132,9054
|
|
56
|
Bario
|
Ba
|
137,328
|
|
57
|
Lantanio
|
La
|
138,9055
|
|
58
|
Cerio
|
Ce
|
140,115
|
|
59
|
Praseodimio
|
Pr
|
140,908
|
|
60
|
Neodimio
|
Nd
|
144,24
|
|
61
|
Promezio
|
Pm
|
145
|
|
62
|
Samario
|
Sm
|
150,36
|
|
63
|
Europio
|
Eu
|
151,96
|
|
64
|
Gadolinio
|
Gd
|
157,25
|
|
65
|
Terbio
|
Tb
|
158,9253
|
|
66
|
Disprosio
|
Dy
|
162,500
|
|
67
|
Olmio
|
Ho
|
164,9303
|
|
68
|
Erbio
|
Er
|
167,26
|
|
69
|
Tulio
|
Tm
|
168,9342
|
|
70
|
Itterbio
|
Yb
|
173,04
|
|
71
|
Lutezio
|
Lu
|
174,967
|
|
72
|
Afnio
|
Hf
|
178,49
|
|
73
|
Tantalio
|
Ta
|
180,948
|
|
74
|
Wolframio (Tungsteno)
|
W
|
183,84
|
|
75
|
Renio
|
Re
|
186,207
|
|
76
|
Osmio
|
Os
|
190,23
|
|
77
|
Iridio
|
Ir
|
192,217
|
|
78
|
Platino
|
Pt
|
195,08
|
|
79
|
Oro
|
Au
|
196,9665
|
|
80
|
Mercurio
|
Hg
|
200,59
|
|
81
|
Tallio
|
Tl
|
204,3833
|
|
82
|
Piombo
|
Pb
|
207,20
|
|
83
|
Bismuto
|
Bi
|
208,9804
|
|
84
|
Polonio
|
Po
|
209
|
|
85
|
Astato
|
At
|
210
|
|
86
|
Radon
|
Rn
|
222
|
|
87
|
Francio
|
Fr
|
223
|
|
88
|
Radio
|
Ra
|
226
|
|
89
|
Attinio
|
Ac
|
227
|
|
90
|
Torio
|
Th
|
232,03
|
|
91
|
Protoattinio
|
Pa
|
231,036
|
|
92
|
Uranio
|
U
|
238,0289
|
|
93
|
Nettunio
|
Np
|
237
|
|
94
|
Plutonio
|
Pu
|
244
|
|
95
|
Americio
|
Am
|
243
|
|
96
|
Curio
|
Cm
|
247
|
|
97
|
Berkelio
|
Bk
|
247
|
|
98
|
Californio
|
Cf
|
251
|
|
99
|
Einsteinio
|
Es
|
252
|
|
100
|
Fermio
|
Fm
|
257
|
|
101
|
Mendelevio
|
Md
|
258
|
|
102
|
Nobelio
|
No
|
259
|
|
103
|
Laurenzio
|
Lr
|
260
|
|
104
|
Rutherfordio
|
Rf
|
261
|
|
105
|
Dubnio
|
Db
|
262
|
|
106
|
Seaborgio
|
Sg
|
266
|
|
107
|
Bohrio
|
Bh
|
262
|
|
108
|
Hassio
|
Hs
|
263
|
|
109
|
Meitnerio
|
Mt
|
268
|
|
110
|
Darmstadtio
|
Ds
|
271
|
|
111
|
Roentgenio
|
Rg
|
272
|
|
112
|
Ununbio
|
Uub
|
277
|
* unità di massa atomica
|
|
