Which of the following triads have unequal size?

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Na⊕,Mg2+,Al3+ (isoelectronic)

Mn⊕,Fe2+,Cr (isoelectronic)

F⊖,Ne,O2− (isoelectronic)

Fe,Co,Ni

answer is A.

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Detailed Solution

Isoelectronic species doesn't have equal size.

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