Question

Give a short note on valency

Answer 1

In chemistry, the valence of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. The concept of valence was developed in the second half of the 19th century and was successful in explaining the molecular structure of inorganic and organic Compounds.

the Combining capacity of an atom is called valency

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Answer 2

It is a combining capacity of an element. It the outermost shall of an element in which electrons are present. for example helium,in outermost shall there one electron is present so it's valency is one. we find valency by formula 2n^2.