MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic Chemistryp-Block (group 13 and 14)Previous Year Questions

The correct order of atomic radii in group 13 elements is (NEET 2018)

A.B < Al <Ga< In <Tl

B.B <Ga< Al <Tl< In

C.B < Al < In <Ga<Tl

D.B <Ga< Al < In <Tl✓ Correct

Explanation

According, to general trend of atomic size, atomic size increases down the group as electrons are added to new shells and effective nuclear charge decreases. But in group 13, Ga due to its poor shielding effect its effective nuclear charge is little greater than Al. Thus the trend of atomic size follows the order: B < Ga < Al < In < Tl Hence, the correct option is (d).

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