Shapes and Angles of Molecules

Question 1

What is the angle in a tetrahedral molecule and how many bonded pairs and lone pairs of electrons are there?

Answer 1

4 bonded pairs. 0 lone pairs.

Angle= 109.5

Question 2

What is the angle in a non-linear molecule and how many bonded pairs and lone pairs of electrons are there?

Answer 2

2 bonded pairs. 2 lone pairs

Angle= 104.5

Question 3

What is the angle in an octahedral molecule and how many bonded pairs and lone pairs of electrons are there?

Answer 3

6 bonded pairs. 0 lone pairs

Angle= 90

Question 4

What is the angle in a linear molecule and how many bonded pairs and lone pairs of electrons are there?

Answer 4

2 bonded regions. 1 lone pair

Angle= 180

Question 5

What is the angle in a trigonal planar molecule and how many bonded pairs and lone pairs of electrons are there?

Answer 5

3 bonded pairs. 0 lone pairs

Angle= 120

Question 6

What is the angle in a pyramidal molecule and how many bonded pairs and lone pairs of electrons are there?

Answer 6

3 bonded pairs. 1 lone pair

Angle= 107

Question 7

What is the order of repulsion?

Answer 7

Lone pair> Double bond>Single bond

Question 8

What is the order or repulsion of lone/bonding pairs?

Answer 8

Bonded-pair/Bonded-pair

Question 9

By how much does a lone pair reduce the bonding angle?

Answer 9

2.5 degrees

Question 10

How is a molecule’s shape determined now?

Answer 10

• Electron pairs minimise repulsion
• Lone pairs of electrons are more repulsive than bonded pairs
• The number of bonded pairs and lone pairs