Question

what do you mean by valence electron? how you can define valency of an element​

Answer 1

Explanation:

The outermost electron shell of an atom is called valence shell. The electrons present in outermost shell of an atom are called as valence electrons.

Valency of an element is defined as the number of hydrogen atoms that can combine with or replace one atom of the element, either directly or indirectly.

(The valence electron of an atom take part in a chemical reaction because they have more energy than all the inner electrons

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.)