Question

What will be the valency of an atom if it contains 3 protons and 4 neutrons?

Answer 1

valency of an atom = 4-3
=1
So valency is 1

Answer 2

If an atom contains 3 protons and 4 neutrons then atom will be of Lithium element.

Lithium's Electronic Configuration:
Shells:. K , L
Electrons: 2 , 1

or

$1 {s}^{2} \: 2 {s}^{1}$


The outermost orbit of Lithium has 1 Electron so it's valency could be +1 or -1.

hope it helps u ^-^