Question

Why does the ionization enthalpy gradually decrease in a group?

Answer 1

It decreases down the group because atomic radius increases means number of shells or size increases and shielding effect decreses.

So nucleus exerts weak force on outermost electrons and minimum amount of energy is required to remove an electron. So ionization energy decreses down the group.

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Answer 2

Answer:

Ionization enthalpy gradually decrease in a group because the nuclear charge on valence electrons decreases on moving down a group, hence, the electrons are held loosely and also the atomic size increases down a group.

HOPE IT HELPS!!!!

Explanation: