Question

Why valency depends upon the number of shells in an atom tell in briefly

Answer 1

Answer:

Valency means the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.

Explanation:

A shell can usually take upto 8 electrons, so how many ever electrons it has in its valence (last/outermost) shell + x should be 8

Thats why for example, carbon's valency is 4