The exhibition of highest co-ordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in MF^{3-}_{6}?

(i) B
(ii) Al
(iii) Ga
(iv) In

Answers (1)

The answer is the option (i) B

The element M in the complex ion MF^{3-}_{6}   has 6 as the coordination number and the B has no d orbitals. Therefore the maximum coordination number it can show is 4 and cannot form the MF^{3-}_{6}.

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