Question

Explain, the structure of ammonia.

Answer 1

The ammonia molecule has a trigonal pyramidal shape as predicted by the valence shell electron pair repulsion theory (VSEPR theory) with an experimentally determined bond angle of 106.7°. The central nitrogen atom has five outer electrons with an additional electron from each hydrogen atom.


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Answer 2

Explanation:

According to VSEPR theory:

Number of electron pairs =$\frac{1}{2}[V+N-C+A]$

For $NH_3$

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 =$\frac{1}{2}[5+3-0+0]=4$

The number of electron pairs is 4 that means the hybridization will be  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.

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