1.

Which of the following triads have approximately equal size ?A. `Na^(o+), Mg^(2+), Al^(3-)` (isoelectronic)B. `F^(ɵ), Ne, O^(2-)` (isoelectronic)C. `Fe, Co, Ni`D. `Mn^(1+), Fe^(2+), Cr` (isoelectronic)

Answer» Correct Answer - C
Triads of group `VIII` (groups `8, 9` and `10`) have approximately the same size, e.g.
Ist triad, `Fe, Co, Ni`
Iind triad, `Ru, Rh, Pd`
IIIrd triad, `Os, Ir, Pt`


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