Molecular Geometry

Question 1

What is the electron pair geometry for 0 lone pairs?

Answer 1

Linear at 180°

Linear geometry occurs when there are two electron pairs around the central atom.

Question 2

What is the electron pair geometry for 1 lone pair?

Answer 2

Trigonal pyramidal at <109°

The presence of a lone pair distorts the ideal tetrahedral angle.

Question 3

What is the electron pair geometry for 2 lone pairs?

Answer 3

Bent or angular at <120°

The lone pairs push the bonding pairs closer together, reducing the bond angle.

Question 4

What is the electron pair geometry for 3 lone pairs?

Answer 4

T-shaped at <90°

This geometry occurs in an octahedral arrangement with three lone pairs.

Question 5

What is the electron pair geometry for 4 lone pairs?

Answer 5

Square planar at 90°

In this arrangement, the lone pairs occupy opposite positions to minimize repulsion.

Question 6

What is the bond angle for a tetrahedral electron pair geometry?

Answer 6

109°

Tetrahedral geometry is characterized by four bonding pairs and no lone pairs.

Question 7

How does the presence of lone pairs affect molecular structures?

Answer 7

Molecular structures are modified from electron pair geometries when lone pairs are present.

This modification results in different shapes and bond angles.

Question 8

What is the electron pair geometry for 6 electron pairs?

Answer 8

Octahedral

Octahedral geometry is characterized by six bonding pairs and no lone pairs.

Question 9

Fill in the blank: For 3 lone pairs, the electron pair geometry is _______.

Answer 9

T-shaped

Question 10

True or False: Molecular structures are identical to electron pair geometries when there are no lone pairs present.

Answer 10

True

Question 11

What is the bond angle for trigonal planar geometry?

Answer 11

120°

Trigonal planar geometry occurs with three bonding pairs and no lone pairs.