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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

Template:Element color legend

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)

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ar:جدول دوري (توزيع إلكتروني) th:ตารางธาตุ (การจัดเรียงอิเล็กตรอน)

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Health Dictionary

Periodic table (electron configurations)

Introduction

References