Question

What do you mean by valenced electrons ? What is the relation between valency and the valenced electron of the atom of an element?

Answer 1

Valence electron is simply the total number of electrons present in outermost shell of an atom.

Valency is the number of electrons an atom looses,gains or shares with other atoms in order to get a stable configuration.

For example-

C ( 6 ) = 2,4

Valency of Carbon will be 4 as it needs 4 more electrons to get a stable configuration.

Number of valence electrons in carbon is also four as it's outermost shell contains 4 electrons.

N ( 7 ) = 2,5

Valency of nitrogen is 3 as it needs 3 more electrons to complete its octet but number of valence electrons in nitrogen is 5.

Remember, the number of valence electrons is always definite for an atom and may or may not be equal to its valency. But valency of an atom may differ and may be variable as well in different compounds.

Hope this helps.