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Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period

1A

2A

3A

4A

5A

6A

7A

8A

1 1
H
1.01
  2
He
4.00
2 3
Li
6.94
4
Be
9.01
  5
B
10.81
6
C
12.01
7
N
14.01
8
O
15.9994
9
F
18.998
10
Ne
20.1797
3 11
Na
22.99
12
Mg
24.31
  3B 4B 5B 6B 7B

┌─ 8B ──┐

1B 2B 13
Al
26.98
14
Si
28.09
15
P
30.97
16
S
32.065
17
Cl
34.45

18
Ar
39.948

4 19
K
39.1
20
Ca
40.08
  21
Sc
44.96
22
Ti
47.867
23
V
50.94
24
Cr
51.996
25
Mn
54.94
26
Fe
55.85
27
Co
58.93
28
Ni
58.69
29
Cu
63.55
30
Zn
65.41
31
Ga
69.723
32
Ge
72.64
33
As
74.92160
34
Se
78.96
35
Br
79.90
36
Kr
83.798
5 37
Rb
85.47
38
Sr
87.62
  39
Y
88.91
40
Zr
91.224
41
Nb
92.91
42
Mo
95.94
43
Tc
[98]
44
Ru
101.07
45
Rh
102.91
46
Pd
106.42
47
Ag
107.87
48
Cd
112.41
49
In
114.818
50
Sn
118.71
51
Sb
121.760
52
Te
127.60
53
I
126.90
54
Xe
131.29
6 55
Cs
132.91
56
Ba
137.33
* 71
Lu
174.97
72
Hf
178.49
73
Ta
180.95
74
W
183.84
75
Re
186.21
76
Os
190.23
77
Ir
192.22
78
Pt
195.08
79
Au
196.97
80
Hg
200.59
81
Tl
204.38
82
Pb
207.2
83
Bi
208.98
84
Po
[209]
85
At
[210]
86
Rn
[222]
7 87
Fr
[223]
88
Ra
[226]
** 103
Lr
[262]
104
Rf
[261]
105
Db
[262]
106
Sg
[266]
107
Bh
[264]
108
Hs
[269]
109
Mt
[268]
110
Ds
[271]
111
Uuu
[272]
112
Uub
[285]
  114
Uuq
[289]
   
   
*Lanthanides * 57
La
138.91
58
Ce
140.12
59
Pr
140.91
60
Nd
144.24
61
Pm
[145]
62
Sm
150.36
63
Eu
151.96
64
Gd
157.25
65
Tb
158.93
66
Dy
162.50
67
Ho
164.93
68
Er
167.259
69
Tm
168.93
70
Yb
173.04
   
**Actinides ** 89
Ac
[227]
90
Th
232.04
91
Pa
231.04
92
U
238.03
93
Np
[237]
94
Pu
[244]
95
Am
[243]
96
Cm
[247]
97
Bk
[247]
98
Cf
[251]
99
Es
[252]
100
Fm
[257]
101
Md
[258]
102
No
[259]