SHAPE OF MOLECULES

For these compounds - H2S, CIF3, XeF4

a) predict the shape of the molecular orbitals around the central atom
b) explore the shape of the actual molecule and give the change in the angle size and the reason
for it

by joeyeehu...

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Chemistry
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S(6e) ; 2H(2e) ; Total = 8 electrons = 4 electron pairs
The basic shape is tetrahedral.
But there are 2 bond pairs and 2 lone pairs
So, it is V-shaped with bond angle around 104.5 degree
( the strength of electron pairs repulsion decreases from lone pair-lone pair > lone pair-bond pair > bond pair-bond pair )

Cl(7e) ; 3F(3e) ; Total = 10 electrons = 5 electron pairs
The basic shape is trigonal bipyramidal
But there are 2 lone pairs and 3 bond pairs.
The 2 lone pairs are situated on the trigonal plane because they are 120 degree apart.
So, it is T-shaped.

Xe(8e) ; 4F(4e) ; Total = 12 electrons = 6 electron pairs
The basic shape is octahedral.
But there are 2 lone pairs and 4 bond pairs.
The 2 lone pairs are opposite to each other.
So, its shape is square planar.