周
期
I A
1
1
H
氢
1.0079
IIA
IIIA
IVA
VA
VIA
VIIA
2
He
氦
4.0026
2
3
Li
锂
6.941
4
Be
铍
9.0122
5
B
硼
10.811
6
C
碳
12.011
7
N
氮
14.007
8
O
氧
15.999
9
F
氟
18.998
10
Ne
氖
20.17
3
11
Na
钠
22.9898
12
Mg
镁
24.305
IIIB
IVB
VB
VIB
VIIB
VIII
IB
IIB
13
Al
铝
26.982
14
Si
硅
28.085
15
P
磷
30.974
16
S
硫
32.06
17
Cl
氯
35.453
18
Ar
氩
39.94
4
19
K
钾
39.098
20
Ca
钙
40.08
21
Sc
钪
44.956
22
Ti
钛
47.9
23
V
钒
50.9415
24
Cr
铬
51.996
25
Mn
锰
54.938
26
Fe
铁
55.84
27
Co
钴
58.9332
28
Ni
镍
58.69
29
Cu
铜
63.54
30
Zn
锌
65.38
31
Ga
镓
69.72
32
Ge
锗
72.59
33
As
砷
74.9216
34
Se
硒
78.9
35
Br
溴
79.904
36
Kr
氪
83.8
5
37
Rb
铷
85.467
38
Sr
锶
87.62
39
Y
钇
88.906
40
Zr
锆
91.22
41
Nb
铌
92.9064
42
Mo
钼
95.94
43
Tc
锝
99
44
Ru
钌
101.07
45
Rh
铑
102.906
46
Pd
钯
106.42
47
Ag
银
107.868
48
Cd
镉
112.41
49
In
铟
114.82
50
Sn
锡
118.6
51
Sb
锑
121.7
52
Te
碲
127.6
53
I
碘
126.905
54
Xe
氙
131.3
6
55
Cs
铯
132.905
56
Ba
钡
137.33
57-71
La-Lu
镧系
72
Hf
铪
178.4
73
Ta
钽
180.947
74
W
钨
183.8
75
Re
铼
186.207
76
Os
锇
190.2
77
Ir
铱
192.2
78
Pt
铂
195.08
79
Au
金
196.967
80
Hg
汞
200.5
81
Tl
铊
204.3
82
Pb
铅
207.2
83
Bi
铋
208.98
84
Po
钋
(209)
85
At
砹
(201)
86
Rn
氡
(222)
7
87
Fr
钫
(223)
88
Ra
镭
226.03
89-103
Ac-Lr
锕系
104
Rf
鑪
(261)
105
Db
钅杜
(262)
106
Sg
钅喜
(266)
107
Bh
钅波
(264)
108
Hs
钅黑
(269)
109
Mt
钅麦
(268)
110
Ds
鐽
(271)
111
Rg
錀
(272)
112
Uub
(285)
113
Uut
(284)
114
Uuq
(289)
115
Uup
(288)
116
Uuh
(292)
117
Uus
118
Uuo
镧
系
57
La
镧
138.905
58
Ce
铈
140.12
59
Pr
镨
140.91
60
Nd
钕
144.2
61
Pm
钷
147
62
Sm
钐
150.4
63
Eu
铕
151.96
64
Gd
钆
157.25
65
Tb
铽
158.93
66
Dy
镝
162.5
67
Ho
钬
164.93
68
Er
铒
167.2
69
Tm
铥
168.934
70
Yb
镱
173.0
71
Lu
镥
174.96
锕
系
89
Ac
锕
(227)
90
Th
钍
232.03
91
Pa
镤
231.03
92
U
铀
238.02
93
Np
镎
237.04
94
Pu
钚
(244)
95
Am
镅
(243)
96
Cm
锔
(247)
97
Bk
锫
(247)
98
Cf
锎
(251)
99
Es
锿
(254)
100
Fm
镄
(257)
101
Md
钔
(258)
102
No
锘
(259)
103
Lr
铹
(260)