Question

friends plz answer how to find bond angle??​

Answer 1

There are three basic steps to determining the bond angles in a molecule:

Explanation:

1. Write the Lewis dot structure for the molecule.

Assume that you must determine the bond angles in

BF

3

.

B

is less electronegative than

F

, so

B

becomes the central atom.

If we have three

F

atoms, that means that we are going to use all three electrons from the

B

This gives us three bonding pairs of electrons and 0 nonbonding pairs.

Thus, the steric number, SN — the number of non-bonding and bonding electron groups (Note: single, double, and triple bonds all count as one electron group).

The SN is also known as the number of ELECTRON DOMAINS.

2. Use the steric number and VSEPR theory to determine the electron domain geometry of the molecule.

To get the VSEPR geometry, imagine that there is a sphere around the central atom.

Place the electron pairs on the surface of the sphere so that they are as far apart as possible.

This is how two to six electron domains arrange themselves on the surface of a sphere.

Electron Domain Geometries

Electron Domain Geometries

Three electron groups arrange themselves evenly around the equator of the sphere to give a trigonal planar shape.

3. Use the VSEPR shape to determine the angles between the electron domains.

From elementary math, we know that a circle is composed of 360 °.

We divide this number by the number of electron domains and get

360

°

3

=

120

°

.

Thus, the bond angles in

BF

3

are 120 °.

Answer 2

We can determine bond angle of a molecule by three simple methods:-

• By using lewis structure method
• Use the steric number and VSEPR theory to determine the electron domain geometry of the molecule.
• Use the VSEPR shape to determine the angles between the electron domains.

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Hope it helps you :)

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