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Periodic table (electron configurations)



Electron configurations of the neutral gaseous atoms in the ground state.

1s:

1
H

1

2
He

2

[He]
+

2s:
2p:

3
Li

1
-

4
Be

2
-

5
B

2
1

6
C

2
2

7
N

2
3

8
O

2
4

9
F

2
5

10
Ne

2
6

[Ne]
+

3s:
3p:

11
Na

1
-

12
Mg

2
-

13
Al

2
1

14
Si

2
2

15
P

2
3

16
S

2
4

17
Cl

2
5

18
Ar

2
6

[Ar]
+

4s:
3d:
4p:

19
K

1
-
-

20
Ca

2
-
-

21
Sc

2
1
-

22
Ti

2
2
-

23
V

2
3
-

24
Cr

1
5
-

25
Mn

2
5
-

26
Fe

2
6
-

27
Co

2
7
-

28
Ni

2
8
-

29
Cu

1
10
-

30
Zn

2
10

-

31
Ga

2
10

1

32
Ge

2
10

2

33
As

2
10

3

34
Se

2
10

4

35
Br

2
10

5

36
Kr

2
10
6

[Kr]
+

5s:
4d:
5p:

37
Rb

1
-
-

38
Sr

2
-
-

39
Y

2
1
-

40
Zr

2
2
-

41
Nb

1
4
-

42
Mo

1
5
-

43
Tc

2
5
-

44
Ru

1
7
-

45
Rh

1
8
-

46
Pd

-
10
-

47
Ag

1
10
-

48
Cd

2
10

-

49
In

2
10

1

50
Sn

2
10

2

51
Sb

2
10

3

52
Te

2
10

4

53
I

2
10

5

54
Xe

2
10
6

[Xe]
+

6s:
4f:
5d:
6p:

55
Cs

1
-
-
-

56
Ba

2
-
-
-

57
La

2
-
1
-

58
Ce

2
1
1
-

59
Pr

2
3
-
-

60
Nd

2
4
-
-

61
Pm

2
5
-
-

62
Sm

2
6
-
-

63
Eu

2
7
-
-

64
Gd

2
7
1
-

65
Tb

2
9
-
-

66
Dy

2
10
-
-

67
Ho

2
11
-
-

68
Er

2
12
-
-

69
Tm

2
13
-
-

70
Yb

2
14

-
-

71
Lu

2
14

1
-

72
Hf

2
14

2
-

73
Ta

2
14

3
-

74
W

2
14

4
-

75
Re

2
14

5
-

76
Os

2
14

6
-

77
Ir

2
14

7
-

78
Pt

1
14
9
-

79
Au

1
14
10

-

80
Hg

2
14
10

-

81
Tl

2
14
10

1

82
Pb

2
14
10

2

83
Bi

2
14
10

3

84
Po

2
14
10

4

85
At

2
14
10

5

86
Rn

2
14
10
6

[Rn]
+

7s:
5f:
6d:
7p:

87
Fr

1
-
-
-

88
Ra

2
-
-
-

89
Ac

2
-
1
-

90
Th

2
-
2
-

91
Pa

2
2
1
-

92
U

2
3
1
-

93
Np

2
4
1
-

94
Pu

2
6
-
-

95
Am

2
7
-
-

96
Cm

2
7
1
-

97
Bk

2
9
-
-

98
Cf

2
10
-
-

99
Es

2
11
-
-

100
Fm

2
12
-
-

101
Md

2
13
-
-

102
No

2
14

-
-

103
Lr

2
14

-
1

104
Rf

2
14

2
-

105
Db

 
 
 
 

106
Sg

 
 
 
 

107
Bh

 
 
 
 

108
Hs

 
 
 
 

109
Mt

 
 
 
 

110
Ds

 
 
 
 

111
Rg

 
 
 
 

112
Uub

 
 
 
 

113
Uut

 
 
 
 

114
Uuq

 
 
 
 

115
Uup

 
 
 
 

116
Uuh

 
 
 
 

117
Uus

 
 
 
 

118
Uuo

 
 
 
 

  • Grayed out electron numbers indicate subshells that are filled to their maximum.
  • Configurations of elements with light gray background are uncertain or not available.

Additional recommended knowledge

Configurations that are unavailable are guessed to be similar to the element directly above on the Periodic Table.

  • The bracketed noble gas symbols on the left represent the inner configurations that are the same in each period. Written out these are:
He, 2, helium : 1s2
Ne, 10, neon : 1s2 2s2 2p6
Ar, 18, argon : 1s2 2s2 2p6 3s2 3p6
Kr, 36, krypton : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
Xe, 54, xenon : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6
Rn, 86, radon : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6
  • Note the non-linear shell ordering, which comes about is due to the different energies of smaller and larger shells.

References

electron configurations of the elements (data page)

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Periodic_table_(electron_configurations)". A list of authors is available in Wikipedia.
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