Question

what is valancy ? give me answer

Answer 1

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

the valency an element indicates it's combining capacity