Valency

In chemistry, valency is the power of an atom of an element to combine with other atoms measured by the number of electrons which an atom will give, take, or share to form a chemical compound. This is related to the number of spaces left in an atom's electron shells, which is why the only elements with valencies of zero are the noble gases.

List of valencies for the first 103 elements in order of atomic number:

Atomic number	Name of element	Valency
1	Hydrogen	1
2	Helium	0
3	Lithium	1
4	Beryllium	2
5	Boron	3
6	Carbon	2, 4
7	Nitrogen	3, 5
8	Oxygen	2
9	Fluorine	1
10	Neon	0
11	Sodium	1
12	Magnesium	2
13	Aluminium	3
14	Silicon	4
15	Phosphorus	3, 5
16	Sulphur	2, 4, 6
17	Chlorine	1, 3, 5, 7
18	Argon	0
19	Potassium	1
20	Calcium	3, 5
21	Scandium	3
22	Titanium	3, 4
23	Vanadium	2, 3, 4, 5
24	Chromium	2, 3, 6
25	Manganese	2, 3, 4, 6, 7
26	Iron	2, 3
27	Cobalt	2, 3
28	Nickel	2, 3
29	Copper	1, 2
30	Zinc	2
31	Gallium	2, 3
32	Germanium	4
33	Arsenic	3, 5
34	Selenium	2, 4, 6
35	Bromine	1, 3, 5, 7
36	Krypton	0
37	Rubidium	1
38	Strontium	2
39	Yttrium	3
40	Zirconium	4
41	Niobium	3, 5
42	Molybdenum	2, 3, 4, 5, 6
43	Technetium	2, 3, 4, 6, 7
44	Ruthenium	3, 4, 6, 8
45	Rhodium	3, 4
46	Palladium	2, 4
47	Silver	1
48	Cadmium	2
49	Indium	1, 3
50	Tin	2, 4
51	Antimony	3, 5
52	Tellurium	2, 4, 6
53	Iodine	1, 3, 5, 7
54	Xenon	0
55	Caesium	1
56	Barium	2
57	Lanthanum	3
58	Cerium	3, 4
59	Praseodymium	3
60	Neodymium	3
61	Promethium	3
62	Samarium	2, 3
63	Europium	2, 3
64	Gadolinium	3
65	Terbium	3
66	Dysprosium	3
67	Holmium	3
68	Erbium	3
69	Thulium	2, 3
70	Ytterbium	2, 3
71	Lutetium	3
72	Hafnium	4
73	Tantalum	3, 5
74	Tungsten	2, 4, 5, 6
75	Rhenium	1, 4, 7
76	Osmium	2, 3, 4, 6, 8
77	Iridium	3, 4
78	Platinum	2, 4
79	Gold	1, 3
80	Mercury	1, 2
81	Thallium	1, 3
82	Lead	2, 4
83	Bismuth	3, 5
84	Polonium	2, 3, 4
85	Astatine	1, 3, 5, 7
86	Radon	0
87	Francium	1
88	Radium	2
89	Actinium	3
90	Thorium	4
91	Protactinium	4, 5
92	Uranium	3, 4, 5, 6
93	Neptunium	2, 3, 4, 5, 6
94	Plutonium	2, 3, 4, 5, 6
95	Americium	2, 3, 4, 5, 6
96	Curium	2, 3, 4
97	Berkelium	2, 3, 4
98	Californium	2, 3, 4
99	Einsteinium	2, 3
100	Fermium	2, 3
101	Mendelevium	2, 3
102	Nobelium	2, 3
103	Lawrencium	3

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Valency