Bond angle Calculator - VSEPR

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A Bond angle calculator is an online tool that helps in predicting the ideal bond angle in a molecule using the popular AXE method.

This calculator is based on the AXE method. 

Bond angle calculator

 

How to calculate the Bond angle?

The bond angle can be calculated using a simple method which is the AXE method.

AXE is a simple formula to represent the number of atoms bonded to the central atom in a molecule and the number of lone pairs present on the central atom.

axe method to calculate molecular geometry

After finding the number of lone pairs and bonded atoms attached to the central atom, use the VSEPR chart given below to predict the ideal bond angle in a given molecule.

For instance –

  • If the number of lone pairs (E) on the central atom is 2, and the number of bonded atoms (X) attached to the central atom is 4, then the AXE formula becomes – AX4E2So, the ideal bond angle for AX4E2 type molecule according to VSEPR chart is 90º.
  • If the number of lone pairs (E) on the central atom is 2, and the number of bonded atoms (X) attached to the central atom is also 2, then the AXE formula becomes – AX2E2, So, the ideal bond angle for AX2E2 type molecule according to VSEPR chart is <109.5º (104.5º).

Look at the VSEPR chart of the bond angle given below with all the necessary data.

VSEPR notation

Bond pairs

Lone

pairs

Ideal electronic geometry

Molecular geometry

Ideal Bond angles 

Examples

AX2

2

0

Linear

Linear

180°

BeCl2, CO2

AX3

3

0

Trigonal

planar

Trigonal

planar

120°

BF3

AX2E

2

1

Trigonal

planar

Bent

<120° (119°)

SO2

AX4

4

0

Tetrahedral

Tetrahedral

109.5°

CH4, CCl4

AX3E

3

1

Tetrahedral

Trigonal pyramidal

<109.5° (107.5°)

NH3

AX2E2

2

2

Tetrahedral

Bent

<109.5° (104.5°)

H2O

AX5

5

0

Trigonal bipyramidal

Trigonal bipyramidal

90°, 120°

PCl5

AX4E

4

1

Trigonal bipyramidal

Seesaw

ax–ax 180° (173.1°),

eq–eq 120° (101.6°),

ax–eq 90°

SF4

AX3E2

3

2

Trigonal bipyramidal

T-shape

<90° (87.5°), <180° (175°)

ClF3

AX2E3

2

3

Trigonal bipyramidal

Linear

180°

XeF2

AX6

6

0

Octahedral

Octahedral

90°, 180°

SF6

AX5E

5

1

Octahedral

Square pyramidal

 <90° (84.8º)

BrF5

AX4E2

4

2

Octahedral

Square Planar

90°

XeF4

Now, the question arises how will you find the number of lone pairs on the central atom of the molecule. For that, the best way to predict the number of lone pairs and bond pairs in the molecule is using a lewis structure.

Take a look at the guide –

Also, check the detailed guide about – AXE notation

FAQ

What is a bond angle calculator?

A bond angle calculator is an online tool to predict the bond angle in a molecule according to VSEPR (AXE) notation.

bond angle calculator

How can you predict bond angle using VSEPR notation?

You can use a Bond angles chart to predict the ideal bond angle based on VSEPR notation. The VSEPR notation is represented by the AXE formula where A denotes the central atom, X denotes the number of bonded atoms to the central atom, and E denotes the number of lone pairs on the central atom.

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Welcome to Topblogtenz, My name is Vishal Goyal. I am an engineer, chemistry tutor, blogger, and founder of topblogtenz.com. I'm a science geek with a passion for life sciences and chemistry. Being a chemistry tutor and having a degree in Engineering, I know how hard it is to learn by yourself, that is why I created a site where you can find help related to science and chemistry before everyone else.

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