1s 1 1.0 H
1
  PERIODIC TABLE
Atomic number

Mean atomic mass
Element
Electron Configuration
2 4.0 He
2

2s 3 6.9 Li
2-1

4 9.0 Be
2-2
2p 5 10.8 B
2-3

6 12.0 C
2-4
7 14.0 N
2-5

8 16.0 O
2-6
9 19.0 F
2-7

10 20.2 Ne
2-8

3s 11
2-8-1
12 24.3 Mg
2-8-2
3p 13 27.0 Al
2-8-3
14 28.1 Si
2-8-4
15 31.0 P
2-8-5
16 32.1 S
2-8-6
17 35.5 Cl
2-8-7
18 39.9 Ar
2-8-8
4s 19 39.1 K
2-8-8-1
20 40.1 Ca
2-8-8-2
3d 21 45.0 Sc
2-8-9-2
22 47.9 Ti
2-8-10-2
23 50.9 V
2-8-11-2
24 52.0
Cr
2-8-13-1
25 54.9 Mn
2-8-13-2
26 55.8 Fe
2-8-14-2
27 58.9 Co
2-8-15-2
28 58.7 Ni 2-8-16-2
29 63.5 Cu
2-8-18-1
30 65.4
Zn
4p 31 69.7 Ga
32 72.6 Ge
33 74.9 As 34 79.0 Se
35 79.9 Br 36 83.8 Kr
5s 37 85.5 Rb 87.6
Sr
38
4d 39 88.9 Y 40 91.2
Zr
41 92.9 Nb
42 95.9
Mo
43 (99) Tc 44 101.1 Ru 45 102.9 Rh 46 106.4 Pd 47 107.9
Ag
48 112.4
Cd
5p 49 114.8 In 50 118.7 Sn 51 121.8 Sb 52 127.6 Te

53 126.9 I
54 131.3 Xe
6s 55 132.9
Cs
56 137.3
Ba
5d 57 138.9
La
* 72 178.5
Hf
73 181.0
Ta
74 183.9
W
75 186.2
Re
76 190.2
Os
77 192.2 Ir
78 195.1 Pt
79 197.0 Au 80 200.6 Hg
6p 81 204.4
Ti
82 207.2
Pb
83 209.0
Bi
84 (210)
Po
85 (210) At
085_astatine
86 (222)
Rn
7s 87 (223)
Fr
88 (226)
Ra

6d 89 (227)
Ac
! 104 (261)
Rf
105 (262)
Db
106 (263)
Sg
107 (262)
Bh
108 (265)
Hs
109 (266)
Mt

 

*
Lanthanides
140.1
Ce
58
140.9
Pr
59
144.2
Nd
60
(147)
Pm
61
150.4
Sm
62
152.0
Eu
63
64 157.3
Gd

65 158.9
Tb

66 162.5
Dy

67 164.9
Ho

68 167.3
Er

69 168.9
Tm

70 173.0
Yb

71 175.0
Lu

!
Actinides 
90 232.0
Th
91 (231)
Pa
92 238.1
U
93 (237)
Np
94 (244)
Pu
95 (243)
Am
96 (247)
Cm
97 (247)
Bk
98 (251)
Cf
99 (252)
Es
100 (257)
Fm
101 (258)
Md
102 (259)
No
103 (260)
Lr

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Periodic Table