Question

define valence electrons​

Answer 1

Answer:

No. of electrons in outermost shell of an atom

Answer 2

$\huge\text{\underline{Answer}}$

$\sf{\underline{Valance Electrons}}$

Those electrons which are present in the outer most shell of an atom is called it's Valance electrons.

The electrons which take part in a chemical bond during a reaction is called Valance electrons.

Ex:-

In case of sodium having atomic no. 11

Na 11 => 2 , 8 ,1

K ,L, M

It's outer most shell contain 1 electrons hence its valence electrons is 1.