Shapes of molecules

Question 1

electron pairs repel each other

Answer 1

• negatively charged so repel
• lone pairs repel more than bonding pairs
• greatest angles between lone pairs
• bond angles between bonding pairs one often reduced by being pushed together by a lone pair repulsion
• lone pair/ lone pair = biggest angle
• lone pair / bonding pair = 2nd biggest
• bp / bp = smallest

Question 2

shape of molecules

Answer 2

• central atom
• electrons in outer shell
• how many atoms bonded
• add electrons and divide by 2 = number of electron pairs
• compare number of electron pairs wit5h number of bonds to find lone pairs

Question 3

linear

Answer 3

• 2 electrons

- 180

Question 4

trigonal planar

Answer 4

• 3 electron pairs

- 120

Question 5

bent

Answer 5

• 3 electron pairs
• 1 lone pair
• 119

Question 6

tetrahedral

Answer 6

• 4 electron pairs

- 109.5

Question 7

trigonal pryamidal

Answer 7

• 4 electron pairs
• 1 lone pair
• 107

Question 8

non-linear

Answer 8

• 4 electron pairs
• 2 lone pairs
• 104.5

Question 9

trigonal bipyramidal

Answer 9

• five electron pairs

- 120

Question 10

seesaw

Answer 10

• 5 electron pairs
• one lone pair
• 102
• 87

Question 11

-distorted T

Answer 11

• 5 electron pairs
• 2 lone pairs
• 87.5

Question 12

octahedral

Answer 12

• 6 electron pairs

- 90

Question 13

square pryamidal

Answer 13

• 6 electron pairs
• 1 lone pair
• 81.9

Question 14

square planar

Answer 14

• 6 electron pairs
• 2 lone pairs
• 90