Question

Mention the basic tendency of an atom which combines it with other atoms.

Answer 1

Thanks for asking the question.
Naturally every atom tries to attain stability. It attains stability by attaining the noble gas configuration. To do so, it forms chemical bonds with other atoms to share their electrons and ultimately becomes stable. This basic tendency of an atom is called its VALENCY or simply its combining power. It allows the atoms to follow duplet or octet rule.
Hope it helps.

Answer 2

The tendency of the element is to acquire the configuration of the nearest noble gas in their outermost orbit to become stable ..