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Which of the following triads have appro...

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)

Text Solution

Verified by Experts

The correct Answer is:
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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