`SiF_(6)^(2-)` exist but not `CF_(6)^(2-)` explain why ?

1.	`SiF_(6)^(2-)` exist but not `CF_(6)^(2-)` explain why ?
Answer» The main reasons are : (i) six large chloride ions cannot be accommodated around `Si^(4+)` due to limitation of its size. (ii) interaction between lone pair of chloride ion and `Si^(4+)` is not very strong.

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`SiF_(6)^(2-)` exist but not `CF_(6)^(2-)` explain why ?

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