Which of the following species does not exist | vedclass

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Question

(A) Boron belongs to the second period and has a maximum covalency of $4$ because it lacks $d$-orbitals in its valence shell. Therefore,it can form $B

Vedclass · Accepted Answer

$BF_6^{3-}$

Vedclass · Answer

(A) Boron belongs to the second period and has a maximum covalency of $4$ because it lacks $d$-orbitals in its valence shell. Therefore,it can form $BF_4^-$ but cannot expand its octet to form $BF_6^{3-}$. In contrast,$Al$,$Si$,and $Ge$ belong to the third period or higher and possess vacant $d$-orbitals,allowing them to expand their octet and form hexacoordinated species like $AlF_6^{3-}$,$SiF_6^{2-}$,and $GeCl_6^{2-}$.

Which of the following species does not exist?

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