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The ionization enthalpy _________ down the group in the family.

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in Chemistry – Class 11 by (148k points)
The ionization enthalpy _________ down the group in the family.

(a) Increases

(b) Decreases

(c) Constant

(d) Is a regular

I have been asked this question during an internship interview.

Question is taken from p-Block Elements topic in chapter p-Block Elements of Chemistry – Class 11

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The correct choice is (d) Is a regular

The best I can explain: On moving down the group, ionization enthalpy decreases from Boron to aluminium, but the next element gallium has slightly higher ionization enthalpy than aluminium due to the poor shielding of intervening d-electrons, it again increases in indium and then decreases in the last element thallium.

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