Shapes

Question 1

What is the shape of a simple molecule or ion determined by?

Answer 1

The repulsion between the electron pairs that surround the central atom

Question 2

Shape name and bond angle of a molecule with:
* 2 bonding pairs
* 0 lone pairs

Answer 2

Linear
180°

Question 3

Shape name and bond angle of a molecule with:
* 3 bonding pairs
* 0 lone pairs

Answer 3

Trigonal planar
120°

Question 4

Shape name and bond angle of a molecule with:
* 4 bonding pairs
* 0 lone pairs

Answer 4

Tetrahedral
109.5°

Question 5

Shape name and bond angle of a molecule with:
* 5 bonding pairs
* 0 lone pairs

Answer 5

Trigonal bipyramidal
90° and 120°

Question 6

Shape name and bond angle of a molecule with:
* 6 bonding pairs
* 0 lone pairs

Answer 6

Octohedral
90° and 90°

Question 7

Shape name and bond angle of a molecule with:
* 2 bonding pairs
* 1 lone pair

Answer 7

Bent/angular
118°

Question 8

Shape name and bond angle of a molecule with:
* 3 bonding pairs
* 1 lone pair

Answer 8

Trigonal pyramidal
107°

Question 9

Shape name and bond angle of a molecule with:
* 4 bonding pairs
* 1 lone pair

Answer 9

Seesaw/trigonal bipyramidal
90° and <120°

Question 10

Shape name and bond angle of a molecule with:
* 5 bonding pairs
* 1 lone pair

Answer 10

Square pyramidal
90° and 90°

Question 11

Shape name and bond angle of a molecule with:
* 2 bonding pairs
* 2 lone pairs

Answer 11

Bent/angular
104.5°

Question 12

Shape name and bond angle of a molecule with:
* 3 bonding pairs
* 2 lone pairs

Answer 12

Trigonal planar
120° and 90°

Question 13

Shape name and bond angle of a molecule with:
* 4 bonding pairs
* 2 lone pairs

Answer 13

Square planar
90° and 90°

Question 14

Why does a molecule with 2 lone pairs have smaller bond angles than a molecule with 1 long pair?

Answer 14

Lone pair - lone pair repulsion > lone pair - bonding pair repulsion