Which of the following triads have approximately equal size?

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Na⊕,Mg2+,Al3+ (isoelectronic)

F⊖,Ne,O2− (isoelectronic)

Fe,Co,Ni

Mn1+,Fe2+,Cr (isoelectronic)

answer is C.

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Detailed Solution

Triads of group VIII (groups 8,9 and l0) have approximately the same size, e.g.Ist triad, Fe, Co, NiIInd triad, Ru, Rh, PdIIIrd triad, Os, Ir, Pt.

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