Question

give reason:

SiF6^2- exists while CF6^2- does not.

Answer 1

Answer:

Explanation:This is because Carbon does not have D orbitals hence it cannot form six bonds with six fluorine molecules.

Answer 2

Carbon(Z=6) doesn't have d-orbital in its electronic configration (1s2 2s2 2p2)

So, it can't expand to accommodate 6 molecules of F.

whereas, Si(Z=14) has 3-orbital in it configration (1s2 2s2 2p6 3s2 3d2)

therefore, Si can expand to accommodate 6 molecules of F