Elements by Electrons per Shell

An electron shell is a group of orbitals with the same principal quantum number (n). Shells are numbered outward from the nucleus (n = 1, 2, 3, …) and labeled K, L, M, etc. Each shell can hold a maximum of 2n² electrons: the first holds up to 2, the second up to 8, the third up to 18, and so on.

Data available for 118 of 118 elements.

Visualize Electrons per Shell in the periodic table →

118 elements

Elements by Electrons per Shell
		Symbol
1	Hydrogen	H	1
2	Helium	He	2
3	Lithium	Li	2, 1
4	Beryllium	Be	2, 2
5	Boron	B	2, 3
6	Carbon	C	2, 4
7	Nitrogen	N	2, 5
8	Oxygen	O	2, 6
9	Fluorine	F	2, 7
10	Neon	Ne	2, 8
11	Sodium	Na	2, 8, 1
12	Magnesium	Mg	2, 8, 2
13	Aluminum	Al	2, 8, 3
14	Silicon	Si	2, 8, 4
15	Phosphorus	P	2, 8, 5
16	Sulfur	S	2, 8, 6
17	Chlorine	Cl	2, 8, 7
18	Argon	Ar	2, 8, 8
19	Potassium	K	2, 8, 8, 1
20	Calcium	Ca	2, 8, 8, 2
21	Scandium	Sc	2, 8, 9, 2
22	Titanium	Ti	2, 8, 10, 2
23	Vanadium	V	2, 8, 11, 2
24	Chromium	Cr	2, 8, 13, 1
25	Manganese	Mn	2, 8, 13, 2
26	Iron	Fe	2, 8, 14, 2
27	Cobalt	Co	2, 8, 15, 2
28	Nickel	Ni	2, 8, 16, 2
29	Copper	Cu	2, 8, 18, 1
30	Zinc	Zn	2, 8, 18, 2
31	Gallium	Ga	2, 8, 18, 3
32	Germanium	Ge	2, 8, 18, 4
33	Arsenic	As	2, 8, 18, 5
34	Selenium	Se	2, 8, 18, 6
35	Bromine	Br	2, 8, 18, 7
36	Krypton	Kr	2, 8, 18, 8
37	Rubidium	Rb	2, 8, 18, 8, 1
38	Strontium	Sr	2, 8, 18, 8, 2
39	Yttrium	Y	2, 8, 18, 9, 2
40	Zirconium	Zr	2, 8, 18, 10, 2
41	Niobium	Nb	2, 8, 18, 12, 1
42	Molybdenum	Mo	2, 8, 18, 13, 1
43	Technetium	Tc	2, 8, 18, 13, 2
44	Ruthenium	Ru	2, 8, 18, 15, 1
45	Rhodium	Rh	2, 8, 18, 16, 1
46	Palladium	Pd	2, 8, 18, 18
47	Silver	Ag	2, 8, 18, 18, 1
48	Cadmium	Cd	2, 8, 18, 18, 2
49	Indium	In	2, 8, 18, 18, 3
50	Tin	Sn	2, 8, 18, 18, 4
51	Antimony	Sb	2, 8, 18, 18, 5
52	Tellurium	Te	2, 8, 18, 18, 6
53	Iodine	I	2, 8, 18, 18, 7
54	Xenon	Xe	2, 8, 18, 18, 8
55	Cesium	Cs	2, 8, 18, 18, 8, 1
56	Barium	Ba	2, 8, 18, 18, 8, 2
57	Lanthanum	La	2, 8, 18, 18, 9, 2
58	Cerium	Ce	2, 8, 18, 19, 9, 2
59	Praseodymium	Pr	2, 8, 18, 21, 8, 2
60	Neodymium	Nd	2, 8, 18, 22, 8, 2
61	Promethium	Pm	2, 8, 18, 23, 8, 2
62	Samarium	Sm	2, 8, 18, 24, 8, 2
63	Europium	Eu	2, 8, 18, 25, 8, 2
64	Gadolinium	Gd	2, 8, 18, 25, 9, 2
65	Terbium	Tb	2, 8, 18, 27, 8, 2
66	Dysprosium	Dy	2, 8, 18, 28, 8, 2
67	Holmium	Ho	2, 8, 18, 29, 8, 2
68	Erbium	Er	2, 8, 18, 30, 8, 2
69	Thulium	Tm	2, 8, 18, 31, 8, 2
70	Ytterbium	Yb	2, 8, 18, 32, 8, 2
71	Lutetium	Lu	2, 8, 18, 32, 9, 2
72	Hafnium	Hf	2, 8, 18, 32, 10, 2
73	Tantalum	Ta	2, 8, 18, 32, 11, 2
74	Tungsten	W	2, 8, 18, 32, 12, 2
75	Rhenium	Re	2, 8, 18, 32, 13, 2
76	Osmium	Os	2, 8, 18, 32, 14, 2
77	Iridium	Ir	2, 8, 18, 32, 15, 2
78	Platinum	Pt	2, 8, 18, 32, 17, 1
79	Gold	Au	2, 8, 18, 32, 18, 1
80	Mercury	Hg	2, 8, 18, 32, 18, 2
81	Thallium	Tl	2, 8, 18, 32, 18, 3
82	Lead	Pb	2, 8, 18, 32, 18, 4
83	Bismuth	Bi	2, 8, 18, 32, 18, 5
84	Polonium	Po	2, 8, 18, 32, 18, 6
85	Astatine	At	2, 8, 18, 32, 18, 7
86	Radon	Rn	2, 8, 18, 32, 18, 8
87	Francium	Fr	2, 8, 18, 32, 18, 8, 1
88	Radium	Ra	2, 8, 18, 32, 18, 8, 2
89	Actinium	Ac	2, 8, 18, 32, 18, 9, 2
90	Thorium	Th	2, 8, 18, 32, 18, 10, 2
91	Protactinium	Pa	2, 8, 18, 32, 20, 9, 2
92	Uranium	U	2, 8, 18, 32, 21, 9, 2
93	Neptunium	Np	2, 8, 18, 32, 22, 9, 2
94	Plutonium	Pu	2, 8, 18, 32, 24, 8, 2
95	Americium	Am	2, 8, 18, 32, 25, 8, 2
96	Curium	Cm	2, 8, 18, 32, 25, 9, 2
97	Berkelium	Bk	2, 8, 18, 32, 27, 8, 2
98	Californium	Cf	2, 8, 18, 32, 28, 8, 2
99	Einsteinium	Es	2, 8, 18, 32, 29, 8, 2
100	Fermium	Fm	2, 8, 18, 32, 30, 8, 2
101	Mendelevium	Md	2, 8, 18, 32, 31, 8, 2
102	Nobelium	No	2, 8, 18, 32, 32, 8, 2
103	Lawrencium	Lr	2, 8, 18, 32, 32, 8, 3
104	Rutherfordium	Rf	2, 8, 18, 32, 32, 10, 2
105	Dubnium	Db	2, 8, 18, 32, 32, 11, 2
106	Seaborgium	Sg	2, 8, 18, 32, 32, 12, 2
107	Bohrium	Bh	2, 8, 18, 32, 32, 13, 2
108	Hassium	Hs	2, 8, 18, 32, 32, 14, 2
109	Meitnerium	Mt	2, 8, 18, 32, 32, 15, 2
110	Darmstadtium	Ds	2, 8, 18, 32, 32, 16, 2
111	Roentgenium	Rg	2, 8, 18, 32, 32, 17, 2
112	Copernicium	Cn	2, 8, 18, 32, 32, 18, 2
113	Nihonium	Nh	2, 8, 18, 32, 32, 18, 3
114	Flerovium	Fl	2, 8, 18, 32, 32, 18, 4
115	Moscovium	Mc	2, 8, 18, 32, 32, 18, 5
116	Livermorium	Lv	2, 8, 18, 32, 32, 18, 6
117	Tennessine	Ts	2, 8, 18, 32, 32, 18, 7
118	Oganesson	Og	2, 8, 18, 32, 32, 18, 8

Elements by Electrons per Shell

Related properties