STRUCTURE OF NH3

by • 22/08/2013 • GeneralComments (0)383

STRUCTURE OF NH3

The NH3 structure shows that central atom, Nitrogen, is surrounded by tour electron pairs.

 

EPRT:
 

In terms of EPRT, the tetrahedral is the only shape that gives the maximum repulsion.

But in NH3, N has a lone pair of electrons which repels the other bonding orbitals, due to which bond angle is reduced from 109.5º to 107 º.

 

HOM:

In terms of HOM, Nitrogen utilizes only three of the four sp3 hybrid orbitals to form s- sp3 hybrid sigma bonds with three hydrogen atoms and having a non-bonding orbital on the Nitrogen atom.

N (ground state) : 1S² , 2S², 2px² , 2py1

N (excited state) : 1S² , 2S²  , 2px1 , 2py1 , 2py1

 

After hybridization four sp3 hybrid orbitals are formed

The electrons in the non-bonding orbital are associated with only one molecule, while other bonding orbitals are held together tightly by two nuclei of N and l-i»atoms, Due to this reason, the non-bonding orbital occupies a large volume and compresses the bonding orbitals reducing the bond angle from 109.5 º to 107 º.

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