Question

what are the various factors due to which the ionisation enthalpy of the main group elements tends to decreases down the group ?​

Answer 1

Down the group

the size of the atom increase, the last shell of the atom become far from the nucleus, the force of attraction become weak and last electron easily comes out and hence the ionization enthalpy decreases down the group

Answer 2

Answer:

Explanation:Due to increase in atomic radius of elements down the group the electrons become less tightly held by the nucleus. So it becomes easier to remove electrons from it, so ionisation energy decreases