`[SiF_(6)]^(2-)` is known wheares `[SiCl_(6)]^(2-)` not. Give possible reasons.

`[SiF_(6)]^(2-)` is known wheares `[SiCl_(6)]^(2-)` not. Give possible

1.	`[SiF_(6)]^(2-)` is known wheares `[SiCl_(6)]^(2-)` not. Give possible reasons.
Answer» The main reasons are : (i) Due to smaller size of F as compared to Cl, six small F atoms can be easily accomodated around Si atom but six large Cl atoms cannot. (ii) The lone pair of electrons on F are present in a smaller 2p-orbital but in Cl they are present on a larger 3p-orbital. Therefore, interaction of F lone pair electrons with d-orbitals of silicon are stronger than that of Cl lone pairs.

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`[SiF_(6)]^(2-)` is known wheares `[SiCl_(6)]^(2-)` not. Give possible reasons.

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