| Group | I A | II A | III B | IV B | V B | VI B | VII B | VII | I B | II B | III A | IV A | V A | VI A | VII A | 0 (VIII A) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 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
15.99
|
9
F
19.00
|
10
Ne
20.18
|
||||||||||
| 3 |
11
Na
22.99
|
12
Mg
24.31
|
13
Al
26.98
|
14
Si
28.09
|
15
P
30.97
|
16
S
32.07
|
17
Cl
35.45
|
18
Ar
39.95
|
||||||||||
| 4 |
19
K
39.10
|
20
Ca
40.08
|
21
Sc
44.96
|
22
Ti
47.87
|
23
V
50.94
|
24
Cr
52.00
|
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
69.72
|
32
Ge
72.64
|
33
As
74.92
|
34
Se
78.96
|
35
Br
79.90
|
36
Kr
83.80
|
| 5 |
37
Rb
85.47
|
21
Sc
44.96
|
39
Y
88.91
|
40
Zr
91.22
|
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
114.82
|
50
Sn
118.71
|
51
Sb
121.76
|
52
Te
127.60
|
53
I
126.90
|
54
Xe
131.29
|
| 6 |
55
Cs
132.91
|
56
Ba
137.33
|
57
La
138.91
|
72
Hf
178.49
|
73
Ta
180.59
|
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)
|
89
Ac
(227)
|
104
Rf
(261)
|
105
Db
(262)
|
106
Sg
(266)
|
107
Bh
(264)
|
108
Hs
(270)
|
108
Mt
(268)
|
110
Ds
(281)
|
111
Rg
(272)
|
112
Uub
(285)
|
113
Uut
(284)
|
114
Uuq
(289)
|
115
Uup
(288)
|
116
Uuh
(292)
|
117
Uus
(?)
|
118
Uuo
(?)
|
| Lanthanide Series |
58
Ce
140.12
|
59
Pr
140.91
|
60
Nd
144.24
|
61
Pm
(145)
|
62
Sm
150.36
|
63
Eu
151.97
|
64
Gd
157.25
|
65
Tb
158.93
|
66
Dy
162.50
|
67
Ho
164.93
|
68
Er
167.26
|
69
Tm
168.93
|
70
Yb
173.04
|
71
Lu
174.97
|
||||
| Actinide Series |
90
Th
232.04
|
91
Pa
232.04
|
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)
|
102
Lr
(262)
|
||||