Which one of following elements is unable to form MF_{6}^{3-} ion?

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p-Block Elements - I

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

A

$Ga$

B

$Al$

C

$B$

D

$In$

(NEET-2018)

Solution

$\mathrm{MF}_{6}^{-3}$

Boron belongs to $2^{\text {nd }}$ period and it does not have vacant $d-$orbital.

Standard 11

Chemistry

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