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

2
14
3
-

 106
Sg

2
14
4
-

 107
Bh

2
14
5
-

 108
Hs

2
14
6
-

 109
Mt

2
14
7
-

 110
Ds

2
14
8
-

 111
Rg

2
14
9
-

 112
Cn

2
14
10
-

 113
Nh

2
14
10
1

 114
Fl

2
14
10
2

 115
Mc

2
14
10
3

 116
Lv

2
14
10
4

 117
Ts

2
14
10
5

 118
Og

2
14
10
6

Legend for the background color
Background color shows subcategory in the metal–metalloid–nonmetal trend:
Metal Metalloid Nonmetal Unknown
chemical
properties
Alkali metal Alkaline earth metal Lan­thanide Actinide Transition metal Post-​transition metal Polyatomic nonmetal Diatomic nonmetal Noble gas
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
Og, 118, oganesson : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6

References

See list of sources at Electron configurations of the elements (data page).

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