Atomic electron configuration

The electron configuration of an atom specifies the occupation of its orbitals. The atomic orbitals (AOs) are labeled by a principal quantum number n = 1, ..., 7 and a letter that is in one to one correspondence with its angular momentum quantum number l:

See hydrogen-like atom for a further explanation of this notation. See the article "Electron orbital" for the source of the AOs and the building-up principle. A table of atomic electron configurations of all natural elements is given below in increasing atomic number. The following table is a linear form of the Periodic Table of Elements.

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Table of Atomic Electron Configurations
First orbital in shell (ns-orbital) is shaded

Z	Symbol	Element	1s	2s	2p	3s	3p	3d	4s	4p	4d	4f	5s	5p	5d	5f	6s	6p	6d	7s
1	H	Hydrogen	1
2	He	Helium	2
3	Li	Lithium	2	1
4	Be	Beryllium	2	2
5	B	Boron	2	2	1
6	C	Carbon	2	2	2
7	N	Nitrogen	2	2	3
8	O	Oxygen	2	2	4
9	F	Fluorine	2	2	5
10	Ne	Neon	2	2	6
11	Na	Sodium	2	2	6	1
12	Mg	Magnesium	2	2	6	2
13	Al	Aluminium	2	2	6	2	1
14	Si	Silicon	2	2	6	2	2
15	P	Phosphorus	2	2	6	2	3
16	S	Sulfur	2	2	6	2	4
17	Cl	Chlorine	2	2	6	2	5
18	Ar	Argon	2	2	6	2	6
19	Ka	Potassium	2	2	6	2	6		1
20	Ca	Calcium	2	2	6	2	6		2
21	Sc	Scandium	2	2	6	2	6	1	2
22	Ti	Titanium	2	2	6	2	6	2	2
23	V	Vanadium	2	2	6	2	6	3	2
24	Cr	Chromium	2	2	6	2	6	5	1
25	Mn	Manganese	2	2	6	2	6	5	2
26	Fe	Iron	2	2	6	2	6	6	2
27	Co	Cobalt	2	2	6	2	6	7	2
28	Ni	Nickel	2	2	6	2	6	8	2
29	Cu	Copper	2	2	6	2	6	10	1
30	Zn	Zinc	2	2	6	2	6	10	2
31	Ga	Gallium	2	2	6	2	6	10	2	1
32	Ge	Germanium	2	2	6	2	6	10	2	2
33	As	Arsenic	2	2	6	2	6	10	2	3
34	Se	Selenium	2	2	6	2	6	10	2	4
35	Br	Bromine	2	2	6	2	6	10	2	5
36	Kr	Krypton	2	2	6	2	6	10	2	6
37	Rb	Rubidium	2	2	6	2	6	10	2	6			1
38	Sr	Strontium	2	2	6	2	6	10	2	6			2
39	Y	Yttrium	2	2	6	2	6	10	2	6	1		2
40	Zr	Zirconium	2	2	6	2	6	10	2	6	2		2
41	Nb	Niobium	2	2	6	2	6	10	2	6	4		1
42	Mo	Molybdenum	2	2	6	2	6	10	2	6	5		1
43	Tc	Technetium	2	2	6	2	6	10	2	6	5		2
44	Ru	Ruthenium	2	2	6	2	6	10	2	6	7		1
45	Rh	Rhodium	2	2	6	2	6	10	2	6	8		1
46	Pd	Palladium	2	2	6	2	6	10	2	6	10
47	Ag	Silver	2	2	6	2	6	10	2	6	10		1
48	Cd	Cadmium	2	2	6	2	6	10	2	6	10		2
49	In	Indium	2	2	6	2	6	10	2	6	10		2	1
50	Sn	Tin	2	2	6	2	6	10	2	6	10		2	2
51	Sb	Antimony	2	2	6	2	6	10	2	6	10		2	3
52	Te	Tellurium	2	2	6	2	6	10	2	6	10		2	4
53	I	Iodine	2	2	6	2	6	10	2	6	10		2	5
54	Xe	Xenon	2	2	6	2	6	10	2	6	10		2	6
55	Cs	Caesium	2	2	6	2	6	10	2	6	10		2	6			1
56	Ba	Barium	2	2	6	2	6	10	2	6	10		2	6			2
57	La	Lanthanum	2	2	6	2	6	10	2	6	10		2	6	1		2
58	Ce	Cerium	2	2	6	2	6	10	2	6	10	1	2	6	1		2
59	Pr	Praseodymium	2	2	6	2	6	10	2	6	10	3	2	6			2
60	Nd	Neodymium	2	2	6	2	6	10	2	6	10	4	2	6			2
61	Pm	Promethium	2	2	6	2	6	10	2	6	10	5	2	6			2
62	Sm	Samarium	2	2	6	2	6	10	2	6	10	6	2	6			2
63	Eu	Europium	2	2	6	2	6	10	2	6	10	7	2	6			2
64	Gd	Gadolinium	2	2	6	2	6	10	2	6	10	7	2	6	1		2
65	Tb	Terbium	2	2	6	2	6	10	2	6	10	9	2	6			2
66	Dy	Dysprosium	2	2	6	2	6	10	2	6	10	10	2	6			2
67	Ho	Holmium	2	2	6	2	6	10	2	6	10	11	2	6			2
68	Er	Erbium	2	2	6	2	6	10	2	6	10	12	2	6			2
69	Tm	Thulium	2	2	6	2	6	10	2	6	10	13	2	6			2
70	Yb	Ytterbium	2	2	6	2	6	10	2	6	10	14	2	6			2
71	Lu	Lutetium	2	2	6	2	6	10	2	6	10	14	2	6	1		2
72	Hf	Hafnium	2	2	6	2	6	10	2	6	10	14	2	6	2		2
73	Ta	Tantalum	2	2	6	2	6	10	2	6	10	14	2	6	3		2
74	W	Tungsten	2	2	6	2	6	10	2	6	10	14	2	6	4		2
75	Re	Rhenium	2	2	6	2	6	10	2	6	10	14	2	6	5		2
76	Os	Osmium	2	2	6	2	6	10	2	6	10	14	2	6	6		2
77	Ir	Iridium	2	2	6	2	6	10	2	6	10	14	2	6	7		2
78	Pt	Platinum	2	2	6	2	6	10	2	6	10	14	2	6	9		1
79	Au	Gold	2	2	6	2	6	10	2	6	10	14	2	6	10		1
80	Hg	Mercury	2	2	6	2	6	10	2	6	10	14	2	6	10		2
81	Tl	Thallium	2	2	6	2	6	10	2	6	10	14	2	6	10		2	1
82	Pb	Lead	2	2	6	2	6	10	2	6	10	14	2	6	10		2	2
83	Bi	Bismuth	2	2	6	2	6	10	2	6	10	14	2	6	10		2	3
84	Po	Polonium	2	2	6	2	6	10	2	6	10	14	2	6	10		2	4
85	At	Astatine	2	2	6	2	6	10	2	6	10	14	2	6	10		2	5
86	Rn	Radon	2	2	6	2	6	10	2	6	10	14	2	6	10		2	6
87	Fr	Francium	2	2	6	2	6	10	2	6	10	14	2	6	10		2	6		1
88	Ra	Radium	2	2	6	2	6	10	2	6	10	14	2	6	10		2	6		2
89	Ac	Actinium	2	2	6	2	6	10	2	6	10	14	2	6	10		2	6	1	2
90	Th	Thorium	2	2	6	2	6	10	2	6	10	14	2	6	10		2	6	2	2
91	Pa	Protactinium	2	2	6	2	6	10	2	6	10	14	2	6	10	2	2	6	1	2
92	U	Uranium	2	2	6	2	6	10	2	6	10	14	2	6	10	3	2	6	1	2
93	Np	Neptunium	2	2	6	2	6	10	2	6	10	14	2	6	10	4	2	6	1	2
94	Pu	Plutonium	2	2	6	2	6	10	2	6	10	14	2	6	10	6	2	6		2

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