Question

What is valency
What is the method of valency and its properties

Answer 1

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In chemistry, the valence or valency of an element is a measure of its combining power with other atoms when it forms chemicalcompounds or molecules.
The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.

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Answer 2

Valancy is the combining capacity of an element. it can be treated as the number of electrons lost,gained or shared by an atom during chemical combination