Electron orbital

No.	Element	K	L	M	N	O	P	Q
1	Hydrogen	1
2	Helium	2
3	Lithium	2	1
4	Beryllium	2	2
5	Boron	2	3
6	Carbon	2	4
7	Nitrogen	2	5
8	Oxygen	2	6
9	Fluorine	2	7
10	Neon	2	8
11	Sodium	2	8	1
12	Magnesium	2	8	2
13	Aluminium	2	8	3
14	Silicon	2	8	4
15	Phosphorus	2	8	5
16	Sulfur	2	8	6
17	Chlorine	2	8	7
18	Argon	2	8	8
19	Potassium	2	8	8	1
20	Calcium	2	8	8	2
21	Scandium	2	8	9	2
22	Titanium	2	8	10	2
23	Vanadium	2	8	11	2
24	Chromium	2	8	13	1
25	Manganese	2	8	13	2
26	Iron	2	8	14	2
27	Cobalt	2	8	15	2
28	Nickel	2	8	16	2
29	Copper	2	8	18	1
30	Zinc	2	8	18	2
31	Gallium	2	8	18	3
32	Germanium	2	8	18	4
33	Arsenic	2	8	18	5
34	Selenium	2	8	18	6
35	Bromine	2	8	18	7
36	Krypton	2	8	18	8
37	Rubidium	2	8	18	8	1
38	Strontium	2	8	18	8	2
39	Yttrium	2	8	18	9	2
40	Zirconium	2	8	18	10	2
41	Niobium	2	8	18	12	1
42	Molybdenum	2	8	18	13	1
43	Technetium	2	8	18	14	1
44	Ruthenium	2	8	18	15	1
45	Rhodium	2	8	18	16	1
46	Palladium	2	8	18	18	0
47	Silver	2	8	18	18	1
48	Cadmium	2	8	18	18	2
49	Indium	2	8	18	18	3
50	Tin	2	8	18	18	4
51	Antimony	2	8	18	18	5
52	Tellurium	2	8	18	18	6
53	Iodine	2	8	18	18	7
54	Xenon	2	8	18	18	8
55	Caesium	2	8	18	18	8	1
56	Barium	2	8	18	18	8	2
57	Lanthanum	2	8	18	18	9	2
58	Cerium	2	8	18	19	9	2
59	Praseodymium	2	8	18	21	8	2
60	Neodymium	2	8	18	22	8	2
61	Promethium	2	8	18	23	8	2
62	Samarium	2	8	18	24	8	2
63	Europium	2	8	18	25	8	2
64	Gadolinium	2	8	18	25	9	2
65	Terbium	2	8	18	27	8	2
66	Dysprosium	2	8	18	28	8	2
67	Holmium	2	8	18	29	8	2
68	Erbium	2	8	18	30	8	2
69	Thulium	2	8	18	31	8	2
70	Ytterbium	2	8	18	32	8	2
71	Lutetium	2	8	18	32	9	2
72	Hafnium	2	8	18	32	10	2
73	Tantalum	2	8	18	32	11	2
74	Tungsten	2	8	18	32	12	2
75	Rhenium	2	8	18	32	13	2
76	Osmium	2	8	18	32	14	2
77	Iridium	2	8	18	32	15	2
78	Platinum	2	8	18	32	17	1
79	Gold	2	8	18	32	18	1
80	Mercury	2	8	18	32	18	2
81	Thallium	2	8	18	32	18	3
82	Lead	2	8	18	32	18	4
83	Bismuth	2	8	18	32	18	5
84	Polonium	2	8	18	32	18	6
85	Astatine	2	8	18	32	18	7
86	Radon	2	8	18	32	18	8
87	Francium	2	8	18	32	18	8	1
88	Radium	2	8	18	32	18	8	2
89	Actinium	2	8	18	32	18	9	2
90	Thorium	2	8	18	32	18	10	2
91	Protactinium	2	8	18	32	20	9	2
92	Uranium	2	8	18	32	21	9	2
93	Neptunium	2	8	18	32	22	9	2
94	Plutonium	2	8	18	32	24	8	2
95	Americium	2	8	18	32	25	8	2
96	Curium	2	8	18	32	25	9	2
97	Berkelium	2	8	18	32	27	8	2
98	Californium	2	8	18	32	28	8	2
99	Einsteinium	2	8	18	32	29	8	2
100	Fermium	2	8	18	32	30	8	2
101	Mendelevium	2	8	18	32	31	8	2
102	Nobelium	2	8	18	32	32	8	2
103	Lawrencium	2	8	18	32	32	9	2
104	Rutherfordium	2	8	18	32	32	10	2
105	Dubnium	2	8	18	32	32	11	2
106	Seaborgium	2	8	18	32	32	12	2
107	Bohrium	2	8	18	32	32	13	2
108	Hassium	2	8	18	32	32	14	2
109	Meitnerium	2	8	18	32	32	15	2
110	Darmstadtium	2	8	18	32	32	16	2
111	Unununium	2	8	18	32	32	17	2
112	Ununbium	2	8	18	32	32	18	2
113	Ununtrium	2	8	18	32	32	18	3
114	Ununquadium	2	8	18	32	32	18	4
115	Ununpentium	2	8	18	32	32	18	5
116	Ununhexium	2	8	18	32	32	18	6
117	Ununseptium	2	8	18	32	32	18	7
118	Ununoctium	2	8	18	32	32	18	8

Niels Bohr's electron orbital shell model utilizes the letters K through Q to label the atomic orbitals in the various elements. The maximum occupancy of a shell is represented by where n is the index of the shell.

The number of electrons in a neutral atom increases with the atomic number. The electrons in the outermost shell, or valence electrons, tend to be responsible for an element's chemical behavior. Elements that contain the same number of valence electrons can be grouped together and display similar chemical properties.

Each horizontal row is described as a period. The numbers in each column, or shell, refer to the number of electrons. For example, Helium has two electrons, both of which occupy the K shell.

Electron orbital

See also