Question

define electronic configuration , valency and valence electrons​

Answer 1

Explanation:

Valency is the number of electrons lose,gain or share to attain noble gas configuration. Valence electrons means electrons present in outermost shell.

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Answer 2

Answer:

The number of electrons that are shared, lost or gained by an atom during a chemical reaction is called as the valency of the element. The outermost shell of the atom is called the 'valence shell' and the electrons present in that shell are called the 'valence electrons