Question

SF6 is known but SH6 doesn't why

Answer 1

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ur ansrs
Hybridization of SF6 is Sp3d2 ,

For formation of SH6 the hybridization will be the same.

d orbitals are of very high energy and  Sp3d2hybridization is possible only with highly electronegative elements only like F.

Electronegativety value of H is not sufficient to bring the energy of d orbitals equal to the energy of p orbitals which is required for formation of  Sp3d2  hybrid molecular orbitals. 

Answer 2

sf6 exist because electronegativity of fluorine is most high, it is of small size and high polarising power but it is not possible in SH6.

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