Question

What is valency
With example please
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Answer 1

the number of electrons which consist in valency shell ( the last shell ) ..

which can be gain or loss in the chemical reaction...

eg - Na- 1

C-4

hope it will be helpful to you...

Answer 2

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.