JEE Main Chemistry question

Al and Ga have the same covalent radii because of:

(A)Greater shielding power of -electrons of Ga atoms
(B)Poor shielding power of -electrons of Ga atoms
(C)Poor shielding power of -electrons of Ga atomsCorrect
(D)Greater shielding power of -electrons of Ga atoms

Answer: (C)

Solution

Gallium immediately follows the first transition series, so its electrons shield the nuclear charge poorly; this allows the effective nuclear charge felt by Ga's valence electrons to remain high,

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Question ID VK-138542