Question

What is valency? How is it related to the number of valance electrons?

Answer 1

Valency:

• Valency is defined as the number of electrons lose or gained by an atom to attain a noble gas configuration.
• The number of bonds that an atom can form as part of a compound is expressed by the valency of the element.
• The valency of an element can be increased either by gaining or losing electrons.

Valence electrons: Valance electrons are those electrons that are present in the outermost orbit of the atom.

Valency helps us to understand how atoms join together to form molecules, by understanding valency, we can better predict how chemicals will react with each other.

No. of valance electrons	Valency	Conclusion
1	1	valency equal to the number of electrons.
2	2	valency equal to the number of electrons.
3	3	valency equal to the number of electrons.
4	4	valency equal to the number of electrons.
5	8 - 5 = 3	valency equal to the eight minus number of electrons
6	8 - 6 = 2	valency equal to the eight minus number of electrons
7	8 - 7 = 1	valency equal to the eight minus number of electrons
8	8 - 8 = 0	valency equal to the eight minus number of electrons