Question
Sulphur forms $ SF_{6} $ but not $ SCl_{6} $, Why?
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Answer
The size of chlorine atom is large while size of fluorine atom is smaller. Also chlorine is less electronegative as compared to fluorine. Chlorine fails to pair in empty $d$-orbitals of sulphur. Fluorine easily combine 6 atoms with on sulphur atom due to its small size.
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