Shapes of molecules

Question 1

electrons are positioned __ ___ ___ from eachother in an atom for the greatest stability

Answer 1

as far away

Question 2

what is VSEPR

Answer 2

valence shell electron pair repulsion.. electrons position themselves far away from each other for greatest stability

Question 3

two VSEPR group shape:

angle between bond:

Answer 3

linear

180

Question 4

if there are 3 VSEPR groups, and all three are bonding shape:

angle between bond:

Answer 4

trigonal planar

120

Question 5

if there are 3 VSEPR groups, 2 are bonding and one lone pair, bonding shape:

angle between bond:

Answer 5

bent/angular

less than 120 since lone pair sits closer to the atom and pushes down other groups

Question 6

if there are 4 VSEPR groups, all 4 are bonding, bonding shape:

angle between bond:

Answer 6

tetrahedral

109.5

Question 7

if there are 4 VSEPR groups, 3 are bonding and one lone pair, bonding shape:

angle between bond:

Answer 7

trigonal planar

less than 109.5 since lone pair sits closer to the atom and pushes down other groups

Question 8

if there are 4 VSEPR groups, 2 are bonding and 2 lone pairs, bonding shape:

angle between bond:

Answer 8

bent

less than 109.5 since lone pair sits closer to the atom and pushes down other groups

Question 9

what are the steps to predict the shape of a molecule based on its formula?

Answer 9

1) draw the Lewis dot diagram
2) count VSEPR groups
3) how many VSEPR groups are bonds and how many are lone pairs
4) determine shape