Question

What is ionisation energy?
Which of these has maximum ionisation energy- Na, Mg, Al, Cl, Ar.

Answer 1

The solution is as follows:

1. Ionisation energy: The energy required to remove an electron from the valence shell of a gaseous atom is know as ionisation energy.

2. The maximum ionisation energy is required for Ar. This is because, it is a noble gas and a large amount of energy is required to disturb it's stability.