Which of the following species is not stable?

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Question

(B) The stability of the species $[MX_6]^{2-}$ depends on the size of the central atom $M$ and the steric hindrance caused by the ligands $X$. Silicon

Vedclass · Accepted Answer

$[SiCl_6]^{2-}$

Vedclass · Answer

(B) The stability of the species $[MX_6]^{2-}$ depends on the size of the central atom $M$ and the steric hindrance caused by the ligands $X$. Silicon $(Si)$ is a small atom. When it is surrounded by six large chlorine atoms $(Cl)$,there is significant steric repulsion between the ligands,which makes the $[SiCl_6]^{2-}$ ion unstable. In contrast,$[SiF_6]^{2-}$ is stable because the fluoride ion is small enough to fit around the silicon atom without excessive steric hindrance. Therefore,$[SiCl_6]^{2-}$ is the species that is not stable.

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