1
                             
18
1
1
H
1.10
2
 

Periodic Table
of the Elements

13
14
15
16
17
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
16.00
9
N
19
10
Ne
20.18
3
11
Na
23.00
12
Mg
24.30
3
4
5
6
7
8
9
10
11
12
13
Al
26.98
14
Si
30.97
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
59.93
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
38
Sr
87.62
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
114.81
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
137.32
*
72
Hf
178.94
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
207.20
83
Bi
208.98
84
Po
(209)
85
At
(201)
86
Rn
(222)
7
87
Fr
(223)
88
Ra
(226)
**
104
Rf
(261)
105
Db
(262)
106
Sg
(266)
107
Bh
(264)
108
Hs
(269)
109
Mt
(268)
110
Ds
(271)
111
Rg
(272)
121
Uub
(285)
113
Uut
(284)
114
Uuq
(289)
115
Uup
(288)
116
Uuh
(292)
117
Uus
???
118
Uuo
???
                                     
  * 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
167.27
69
Tm
168.93
70
Yb
173.04
71
Lu
174.97
  ** 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)
103
Lr
(262)