Electron Configurations of Atoms

Ground State Electron Configuration of Atoms

Atomic No. Element Configuration

1

H

1s1

2

He

1s2

3

Li

[He] 2s1

4

Be

[He] 2s2

5

B

[He] 2s22p1

6

C

[He] 2s22p2

7

N

[He] 2s22p3

8

O

[He] 2s22p4

9

F

[He] 2s22p5

10

Ne

[He] 2s22p6

11

Na

[Ne] 3s1

12

Mg

[Ne] 3s2

13

Al

[Ne] 3s23p1

14

Si

[Ne] 3s23p2

15

P

[Ne] 3s23p3

16

S

[Ne] 3s23p4

17

Cl

[Ne] 3s23p5

18

Ar

[Ne] 3s23p6

19

K

[Ar] 4s1

20

Ca

[Ar] 4s2

21

Sc

[Ar] 3d14s2

22

Ti

[Ar] 3d24s2

23

V

[Ar] 3d34s2

24

Cr

[Ar] 3d54s1

25

Mn

[Ar] 3d54s2

26

Fe

[Ar] 3d64s2

27

Co

[Ar] 3d74s2

28

Ni

[Ar] 3d84s2

29

Cu

[Ar] 3d104s1

30

Zn

[Ar] 3d104s2

31

Ga

[Ar] 3d104s24p1

32

Ge

[Ar] 3d104s24p2

33

As

[Ar] 3d104s24p3

34

Se

[Ar] 3d104s24p4

35

Br

[Ar] 3d104s24p5

36

Kr

[Ar] 3d104s24p6

37

Rb

[Kr] 5s1

38

Sr

[Kr] 5s2

39

Y

[Kr]4d15s2

40

Zr

[Kr] 4d25s2

41

Nb

[Kr] 4d45s1

42

Mo

[Kr] 4d55s1

43

Tc

[Kr] 4d55s2

44

Ru

[Kr] 4d75s1

45

Rh

[Kr] 4d85s1

46

Pd

[Kr] 4d10

47

Ag

[Kr] 4d105s1

48

Cd

[Kr] 4d105s2

49

In

[Kr] 4d105s25p1

50

Sn

[Kr] 4d105s25p2

51

Sb

[Kr] 4d105s25p3

52

Te

[Kr] 4d105s25p4

53

I

[Kr] 4d105s25p5

54

Xe

[Kr] 4d105s25p6

55

Cs

[Xe] 6s1

56

Ba

[Xe] 6s2

57

La

[Xe] 5d16s2

58

Ce

[Xe] 4f15d16s2

59

Pr

[Xe] 4f36s2

60

Nd

[Xe] 4f46s2

61

Pm

[Xe] 4f56s2

62

Sm

[Xe] 4f66s2

63

Eu

[Xe] 4f76s2

64

Gd

[Xe] 4f75d16s2

65

Tb

[Xe] 4f96s2

66

Dy

[Xe] 4f106s2

67

Ho

[Xe] 4f116s2

68

Er

[Xe] 4f126s2

69

Tm

[Xe] 4f136s2

70

Yb

[Xe] 4f146s2

71

Lu

[Xe] 4f145d16s2

72

Hf

[Xe] 4f145d26s2

73

Ta

[Xe] 4f145d36s2

74

W

[Xe] 4f145d46s2

75

Re

[Xe] 4f145d56s2

76

Os

[Xe] 4f145d66s2

77

Ir

[Xe] 4f145d76s2

78

Pt

[Xe] 4f145d96s1

79

Au

[Xe] 4f145d106s1

80

Hg

[Xe] 4f145d106s2

81

Tl

[Xe] 4f145d106s26p1

82

Pb

[Xe] 4f145d106s26p2

83

Bi

[Xe] 4f145d106s26p3

84

Po

[Xe] 4f145d106s26p4

85

At

[Xe] 4f145d106s26p5

86

Rn

[Xe] 4f145d106s26p6

87

Fr

[Rn] 7s1

88

Ra

[Rn] 7s2

89

Ac

[Rn] 6d17s2

90

Th

[Rn] 6d27s2

91

Pa

[Rn] 5f26d17s2

92

U

[Rn] 5f36d17s2

93

Np

[Rn] 5f46d17s2

94

Pu

[Rn] 5f67s2

95

Am

[Rn] 5f77s2

96

Cm

[Rn] 5f76d17s2

97

Bk

[Rn] 5f97s2

98

Cf

[Rn] 5f107s2

99

Es

[Rn] 5f117s2

100

Fm

[Rn] 5f127s2

101

Md

[Rn] 5f137s2

102

No

[Rn] 5f147s2

103

Lr

[Rn] 5f147s27p1

104

Rf

[Rn] 5f146d27s2

105

Db

[Rn] 5f146d37s2

106

Sg

[Rn] 5f146d47s2

107

Bh

[Rn] 5f146d57s2

108

Hs

[Rn] 5f146d67s2

109

Mt

[Rn] 5f146d77s2

110

Ds

[Rn] 5f146d97s1

111

Rg

[Rn] 5f146d107s1

112

Cn

[Rn] 5f146d107s2

113

[Rn] 5f146d27s27p1

114

Fl

[Rn] 5f146d27s27p2

115

[Rn] 5f146d27s27p3

116

Lv

[Rn] 5f146d27s27p4

117

[Rn] 5f146d107s27p5

118

[Rn] 5f146d107s27p6

All electron configurations in this table are from experimental determinations except for elements 103-118, which are predicted theoretically. For elements 103-118, only a few atoms can be produced at a time and it is very difficult to determine electron configurations.

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Chemistry 109 Fall 2021 by John Moore, Jia Zhou, and Etienne Garand is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.