Answer: Electronic geometry is tetrahedral and the molecular geometry will be trigonal pyramidal.
Explanation:
According to VSEPR theory:
Number of electron pairs =[tex]\frac{1}{2}[V+N-C+A][/tex]
For [tex]NH_3[/tex]
where,
V = number of valence electrons present in central nitrogen atom = 5
N = number of monovalent atoms = 3
C = charge of cation = 0
A = charge of anion = 0
Number of electron pairs =[tex]\frac{1}{2}[5+3-0+0]=4[/tex]
The number of electron pairs is 4 that means the hybridization will be [tex]sp^3[/tex] but as only 3 atoms are present , one position will be occupied by a lone pair thus electronic geometry is tetrahedral and the molecular geometry will be trigonal pyramidal.
