Question

what is valency give example​

Answer 1

Answer:

The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element.

For example, oxygen has six valence electrons, but its valency is 2. Some elements may have more than one combining power (or valency), while others have just one.

Answer 2

Explanation:

The number of electrons that an atom needs to accept , donate or share in order to attain stability is said to be its valency. If an atom donates electrons to gain stability it is said to have a positive valency. For example, sodium atom donates 1 electron to chlorine atom to become stable.