Which one of the following elements is unable to form $M F_{6}^{3 -}$ ion?

B

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A l

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G a

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I n

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Solution

The correct option is A $B$
$B$ has no vacant d-orbitals and so it cannot extend its covalency beyond 4. i.e. $B$ cannot form an ion like $M F_{6}^{3 -}$ .

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