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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

Chemical series of the periodic table

Alkali metals	Alkaline earth metals	Lanthanides	Actinides	Transition metals
Poor metals	Metalloids	Nonmetals	Halogens	Noble gases

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

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.

[edit] References

electron configurations of the elements (data page)

Periodic tables
Standard table | Vertical table | Table with names | Names and atomic masses (large) | Names and atomic masses (small) | Names and atomic masses (text only) | Inline F-block | Elements to 218 | Electron configurations | Metals and nonmetals | Table by blocks | Alternatives
Lists of elements
Name | Atomic symbol | Atomic number | Boiling point | Melting point | Density | Atomic mass
Groups:   1 -  2 -  3 -  4 -  5 -  6 -  7 -  8 -  9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18
Periods:  1  -  2  -  3  -  4  -  5  -  6  -  7  -  8  -  9
Series:   Alkalis  -  Alkaline earths  -  Lanthanides  -  Actinides  -  Transition metals  -  Poor metals  -  Metalloids  -  Nonmetals  -  Halogens  -  Noble gases
Blocks:  s-block  -  p-block  -  d-block  -  f-block  -  g-block

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