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Gruppo

Periodo

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

   

I

 
1 1

H

1.0079

2 18

He

4.0026
   

II

 
3 1

Li

6.941
4 2

Be

9.0122

5 13

B

10.811
6 14

C

12.01
7 15

N

14.00
8 16

O

15.99
9 17

F

18.99
10 18

Ne

20.17
   

III

11 1

Na

22.98
12 2

Mg

24.30

13 13

Al

26.981
14 14

Si

28.085
15 15

P

30.973
16 16

S

32.065
17 17

Cl

35.453
18 18

Ar

39.948
   

IV

 
19 1

K

39.098
20 2

Ca

40.078
21 3

Sc

44.95
22 4

Ti

47.867
23 5

V

50.941
24 6

Cr

51.996
25 7

Mn

54.938
26 8

Fe

55.845
27 9

Co

58.933
28 10

Ni

58.6934
29 11

Cu

63.546
30 12

Zn

65.39
31 13

Ga

69.723
32 14

Ge

72.64
33 15

As

74.9216
34 16

Se

78.96
35 17

Br

79.904
36 18

Kr

83.8
   

V

 
37 1

Rb

85.467
38 2

Sr

87.62
39 3

Y

88.905
40 4

Zr

91.224
41 5

Nb

92.906
42 6

Mo

95.94
43 7

Tc

98
44 8

Ru

101.07
45 9

Rh

102.90
46 10

Pd

106.42
47 11

Ag

107.86
48 12

Cd

112.411
49 13

In

114.81
50 14

Sn

118.71
51 15

Sb

121.76
52 16

Te

127.6
53 17

I

126.90
54 18

Xe

131.293
   

VI

 
55 1

Cs

132.905
56 2

Ba

137.327
57 3

La

138.905
72 4

Hf

178.49
73 5

Ta

180.94
74 6

W

183.84
75 7

Re

186.207
76 8

Os

190.23
77 9

Ir

192.217
78 10

Pt

195.078
79 11

Au

196.96
80 12

Hg

200.59
81 13

Tl

204.38
82 14

Pb

207.2
83 15

Bi

208.98
84 16

Po

209
85 17

At

210
86 18

Rn

222
   

VII

 
87 1

Fr

223
88 2

Ra

226
89 3

Ac

227
104 4

Rf

261
105 5

Db

262
106 6

Sg

266
107 7

Bh

264
108 8

Hs

277
109 9

Mt

268
110 10

Ds

280
111 11

Rg

280
112 12

Cn

285

58 101

Ce

140.116
59 101

Pr

140.90
60 101

Nd

144.24
61 101

Pm

145
62 101

Sm

150.36
63 101

Eu

151.964
64 101

Gd

157.25
65 101

Tb

158.92
66 101

Dy

162.5
67 101

Ho

164.93
68 101

Er

167.259
69 101

Tm

168.93
70 101

Yb

173.04
71 101

Lu

174.967

90 102

Th

232.03
91 102

Pa

231.03
92 102

U

238.02
93 102

Np

237
94 102

Pu

244
95 102

Am

243
96 102

Cm

247
97 102

Bk

247
98 102

Cf

251
99 102

Es

252
100 102

Fm

257
101 102

Md

258
102 102

No

259
103 102

Lr

262