CHEMICAL

BONDING

NH3Lewis Structure

The counting Order

N=5e H= 1e x 3 =3eTotal = 8e

N

H

HH

BEST LEWIS STRUCTURE

• Formal charge of N= 5-2-3=0• Formal charge of H=1-1=0• Formal charge of H=1-1=0• Formal charge of H=1-1=0 N

H

HH

MOLECULAR GEOMETRY

• The geometrical structure of NH3 take the trigonal pyramidal shape

• The trigonal pyramidal shape is derived from the tetrahedral

• As it have three single bond and one lone pair (AB3E)

• It is also occurred because of the repulsion between the lone pair and the bonding pair

• The bond angle will be closer to 107.3

BEST LEWIS STRUCTURE

N

H HH

POLARITY

• Nitrogen is more electronegative compared to Hydrogen • Polar molecule• EN N = 3.0• EN H = 2.1• NH3 is polar molecule H

HH

N

Resultant dipole moment

HYBRIDIZATION

Ground State

Hybridized orbitals

N = 4 sp3 hybrid orbital

2s 2p sp3

HYBRIDIZATION

NH3 – spᶾ hybridization

INTERMOLECULAR STRUCTURE