Which one of the following elements is unable to form MF63− ion?

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Question

Which one of the following elements is unable to form MF63− ion?

Accepted Answer

Correct Answer: D — BStep-by-step Solution:The MF63− ion is an octahedral complex where the central atom forms 6 bonds, requiring expansion of the octet beyond 4 electron pairs. This is only possible when vacant d-orbitals are available in the valence shell for hybridization (sp3d2).Boron belongs to the second period and has only 1s, 2s, and 2p orbitals available. It has no d-orbitals in its valence shell, so it cannot expand its coordination number beyond 4.Therefore, BF63− cannot be formed. Boron can form BF4− (tetrahedral, sp3) but not BF63−.Al (3rd period), Ga (4th period), and In (5th period) all have vacant d-orbitals available and can form octahedral MF63− complexes.Why other options are incorrect:Al (3s, 3p, 3d), Ga (4s, 4p, 4d), and In (5s, 5p, 5d) all have accessible d-orbitals and can achieve sp3d2 hybridization to form the hexafluoro complex.Key Concept: Octet expansion is possible only for elements of the 3rd period and beyond, which have vacant d-orbitals. Elements of the 2nd period (Li to Ne) are limited to a maximum of 4 bonds due to the absence of d-orbitals.

Which one of the following elements is unable to form MF63− ion?

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Which one of the following elements is unable to form MF63− ion?

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