Question

Why sif6 2 is known whereas sicl6 2- not?

Answer 1

Heya,

sif6 2 is known whereas sicl6 2- not because of the following reasons:-

-» Due to smaller size of F as compared  to Cl.

-» Six small F atoms can be easily accommodated  around si atom while cl cannot since,f are present in smaller 2p orbital and cl are present in larger 3p orbital.

-» Therefore, interaction of f lone pair  electron with d orbitals of silicon are stronger in f as compared cl

HOPE IT HELPS:-))

Answer 2

$\huge\boxed{\underline{\mathcal{\red{A}\green{N}\pink{S}\orange{W}\blue{E}\purple{R}}}}$

❤⭐MAIN REASONS:- ⭐❤

1. six lagre chloride ions cannot be accomodated around ${Si}^4+$ due to $\purple{\tt{Limitation}}$of its size.
2. Interaction between lone pair of chloride ion and${Si^4+}$ is not very strong.