Why does ionization energy decreases down the group?

Assertion : Lithium is the weakest reducing agent among the alkali metals. Reason : In alkali metals, ionization energy decreases down the group .

Ionisation energy decreases down the group due to

Why does the ionisation energy decrease on going down a group?

The ionisation energy decreases on moving down the group 14. Explain

Ionisation energy decreases down the group in periodic table. Give reason .

Assertion : Ionization energy increase does the group. Reason : Atomic size increases down the group.

Ionisation enthalpy decreases down the group in noble gases. Why ?