Bond angle
109∘28′ means Regular Tetrahedral geometry and hybridization is
sp3 .
Steric Number (SN) for
sp3 hybridization is 4.
In
sp3 molecules can have different shapes which is decided by SN number
(1) 4 bond pair in a molecule then angle between bonds
109∘28′ (2) 3 bond pair and 1 lone pair in a molecule then angle between bonds
107∘ .
(3) 2 bond pair and 2 lone pair in a molecule then angle between bonds
104.5∘ (4) 1 bond pair and 3 lone pair in a molecule then bond angle is undefined as there is only one bond.
(1) In
NH3,3 Bond pair(BP) +1 lone pair (LP) present so angle between bond
107∘.
(2)
BF4−,4 bond pair present so angle is
109∘28′.
(3)
InNH4+ , 4 bond pair present so angle between bond is
109∘28′
(4)
BF3 has
sp2 hybridization. So bond angle is
120∘
(5) In
NH2−,2 bond pair and 2 lone pair present, so bond angle is
104.5∘