Periodic table (electron configurations)

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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]
+
3d:
4s:
4p:
19
K
-
1
-
20
Ca
-
2
-
21
Sc
1
2
-
22
Ti
2
2
-
23
V
3
2
-
24
Cr
5
1
-
25
Mn
5
2
-
26
Fe
6
2
-
27
Co
7
2
-
28
Ni
8
2
-
29
Cu
10
1
-
30
Zn
10
2
-
31
Ga
10
2
1
32
Ge
10
2
2
33
As
10
2
3
34
Se
10
2
4
35
Br
10
2
5
36
Kr
10
2
6

[Kr]
+
4d:
5s:
5p:
37
Rb
-
1
-
38
Sr
-
2
-
39
Y
1
2
-
40
Zr
2
2
-
41
Nb
4
1
-
42
Mo
5
1
-
43
Tc
5
2
-
44
Ru
7
1
-
45
Rh
8
1
-
46
Pd
10
-
-
47
Ag
10
1
-
48
Cd
10
2
-
49
In
10
2
1
50
Sn
10
2
2
51
Sb
10
2
3
52
Te
10
2
4
53
I
10
2
5
54
Xe
10
2
6

[Xe]
+
4f:
5d:
6s:
6p:
55
Cs
-
-
1
-
56
Ba
-
-
2
-
57
La
-
1
2
-
58
Ce
1
1
2
-
59
Pr
3
-
2
-
60
Nd
4
-
2
-
61
Pm
5
-
2
-
62
Sm
6
-
2
-
63
Eu
7
-
2
-
64
Gd
7
1
2
-
65
Tb
9
-
2
-
66
Dy
10
-
2
-
67
Ho
11
-
2
-
68
Er
12
-
2
-
69
Tm
13
-
2
-
70
Yb
14
-
2
-
71
Lu
14
1
2
-
72
Hf
14
2
2
-
73
Ta
14
3
2
-
74
W
14
4
2
-
75
Re
14
5
2
-
76
Os
14
6
2
-
77
Ir
14
7
2
-
78
Pt
14
9
1
-
79
Au
14
10
1
-
80
Hg
14
10
2
-
81
Tl
14
10
2
1
82
Pb
14
10
2
2
83
Bi
14
10
2
3
84
Po
14
10
2
4
85
At
14
10
2
5
86
Rn
14
10
2
6

[Rn]
+
5f:
6d:
7s:
7p:
87
Fr
-
-
1
-
88
Ra
-
-
2
-
89
Ac
-
1
2
-
90
Th
-
2
2
-
91
Pa
2
1
2
-
92
U
3
1
2
-
93
Np
4
1
2
-
94
Pu
6
-
2
-
95
Am
7
-
2
-
96
Cm
7
1
2
-
97
Bk
9
-
2
-
98
Cf
10
-
2
-
99
Es
11
-
2
-
100
Fm
12
-
2
-
101
Md
13
-
2
-
102
No
14
-
2
-
103
Lr
14
-
2
1
104
Rf
14
2
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.
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)

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
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

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] + 3d: 4s: 4p:	19 K - 1 -	20 Ca - 2 -		21 Sc 1 2 -	22 Ti 2 2 -	23 V 3 2 -	24 Cr 5 1 -	25 Mn 5 2 -	26 Fe 6 2 -	27 Co 7 2 -	28 Ni 8 2 -	29 Cu 10 1 -	30 Zn 10 2 -	31 Ga 10 2 1	32 Ge 10 2 2	33 As 10 2 3	34 Se 10 2 4	35 Br 10 2 5	36 Kr 10 2 6
[Kr] + 4d: 5s: 5p:	37 Rb - 1 -	38 Sr - 2 -		39 Y 1 2 -	40 Zr 2 2 -	41 Nb 4 1 -	42 Mo 5 1 -	43 Tc 5 2 -	44 Ru 7 1 -	45 Rh 8 1 -	46 Pd 10 - -	47 Ag 10 1 -	48 Cd 10 2 -	49 In 10 2 1	50 Sn 10 2 2	51 Sb 10 2 3	52 Te 10 2 4	53 I 10 2 5	54 Xe 10 2 6
[Xe] + 4f: 5d: 6s: 6p:	55 Cs - - 1 -	56 Ba - - 2 -	57 La - 1 2 -	58 Ce 1 1 2 -	59 Pr 3 - 2 -	60 Nd 4 - 2 -	61 Pm 5 - 2 -	62 Sm 6 - 2 -	63 Eu 7 - 2 -	64 Gd 7 1 2 -	65 Tb 9 - 2 -	66 Dy 10 - 2 -	67 Ho 11 - 2 -	68 Er 12 - 2 -	69 Tm 13 - 2 -	70 Yb 14 - 2 -	71 Lu 14 1 2 -	72 Hf 14 2 2 -	73 Ta 14 3 2 -	74 W 14 4 2 -	75 Re 14 5 2 -	76 Os 14 6 2 -	77 Ir 14 7 2 -	78 Pt 14 9 1 -	79 Au 14 10 1 -	80 Hg 14 10 2 -	81 Tl 14 10 2 1	82 Pb 14 10 2 2	83 Bi 14 10 2 3	84 Po 14 10 2 4	85 At 14 10 2 5	86 Rn 14 10 2 6
[Rn] + 5f: 6d: 7s: 7p:	87 Fr - - 1 -	88 Ra - - 2 -	89 Ac - 1 2 -	90 Th - 2 2 -	91 Pa 2 1 2 -	92 U 3 1 2 -	93 Np 4 1 2 -	94 Pu 6 - 2 -	95 Am 7 - 2 -	96 Cm 7 1 2 -	97 Bk 9 - 2 -	98 Cf 10 - 2 -	99 Es 11 - 2 -	100 Fm 12 - 2 -	101 Md 13 - 2 -	102 No 14 - 2 -	103 Lr 14 - 2 1	104 Rf 14 2 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

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