Which of the following order is CORRECT ?

Question

TestHub · Accepted Answer

(A) is correct because Gallium (Ga) is smaller than Aluminum (Al) due to poor shielding by $3 d$ electrons (d-block contraction).

(C) is correct as Melting Points follow $B > A l > Tl > I n > G a$ ; Gallium has an unusually low melting point due to its unique crystal structure.

(D) is correct because Boiling Points generally decrease regularly down the group as metallic bonding weakens with increasing size.

(B) is incorrect; the Ionization Energy order is $B > Tl > G a > A l > I n$ due to the combined effects of d-block and f-block contractions.

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