A) \[C,Al\]
B) \[Be,Mg\]
C) \[Li,Na\]
D) \[Ga,Al\]
Correct Answer: D
Solution :
Due to the presence of ten electrons in d-orbitals of gallium, its nucleus is not screened effectively. Consequently, effective nuclear charge and thus, also the ionic radii of gallium is almost equal to aluminium.
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