Which one of the following elements is unable | vedclass

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(C) The general formula for the complex ion is $MF_{6}^{3-}$.Boron $(B)$ belongs to the $2^{nd}$ period and has a maximum covalency of $4$ because it

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$B$

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(C) The general formula for the complex ion is $MF_{6}^{3-}$.Boron $(B)$ belongs to the $2^{nd}$ period and has a maximum covalency of $4$ because it lacks vacant $d$-orbitals in its valence shell.Therefore,it cannot expand its octet to form the $BF_{6}^{3-}$ ion.Other elements like $Al$,$Ga$,and $In$ have vacant $d$-orbitals and can form such complex ions.

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

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