Question

a) Define Ionisation energy
b) How it varies in a group and period?

Answer 1

Explanation:

physics and chemistry, ionization energy or ionisation energy is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.

Answer 2

Explanation:

a) ionization energy or ionisation energy is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.

b)

In general, the atomic radius decreases as we move from left to right in a period with an increase in nuclear charge of the element. ... The atomic radius increases when we go down a group because of the addition of extra shell.