# how can we find bond angle? Is there any forluma?pls. Explain with example.

sikandar sharma
29 Points
12 years ago

bond angle of a compound can be found by gathering the information about its hybridisation?

for example: for NH3, its hybridisation is sp3,so bond angle is 104.50.

Ashwin Sinha
520 Points
12 years ago

Dear Vaishal,

One can never get correct bond angle by any formula always, bcoz of lone pair repulsions or due to lack of electrons, but here is a hyb. table, which would help you.

#### VSEPR table

The bond angles in the table below are ideal angles from the simple VSEPR theory, followed by the actual angle for the example given in the following column where this differs. For many cases, such as trigonal pyramidal and bent, the actual angle for the example differs from the ideal angle, but all examples differ by different amounts. For example, the angle in H2S (92°) differs from the tetrahedral angle by much more than the angle for H2O (104.5°) does.

Bonding electron pairsLone pairsElectron domainsShapeIdeal bond angle (example's bond angle)ExampleImage
2 0 2 linear 180° CO2
3 0 3 trigonal planar 120° BF3
2 1 3 bent 120° (119°) SO2
4 0 4 tetrahedral 109.5° CH4
3 1 4 trigonal pyramidal 107.5° NH3
2 2 4 angular 104.5° H2O
5 0 5 trigonal bipyramidal 90°, 120° PCl5
4 1 5 seesaw 180°, 120°, 90° (173.1°, 101.6°) SF4
3 2 5 T-shaped 90°, 180° (87.5°, < 180°) ClF3
2 3 5 linear 180° XeF2
6 0 6 octahedral 90°, 180° SF6
5 1 6 square pyramidal 90° (84.8°), 180° BrF5
4 2 6 square planar 90° 180° XeF4
7 0 7 pentagonal bipyramidal 90°, 72° IF7

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