shapes of molecules and ions

Question 1

explain electron pair repulsion theory ?

Answer 1

pairs of electrons repel so the electron pairs around the central atom will make themselves as far apart as possible

Question 2

two pair of electrons?

Answer 2

linear , 180 apart max

Question 3

three pairs of electron ?

Answer 3

trigonal planar ,120 apart

Question 4

four pairs of electrons ?

Answer 4

tetrahedral,109.5 . 3 dimensial so the angles can add up to more than 360

Question 5

what does a wedge represent ?

Answer 5

a bond coming out of a paper

Question 6

what does a dashed line represent ?

Answer 6

a bond going into the paper

Question 7

five pairs of electrons ?

Answer 7

triganol bi pyramid ,90 ,120

Question 8

six pairs of electrons ?

Answer 8

octahedral ,bond angle 90

Question 9

how do lone pairs effect shape ?

Answer 9

not involved in bonding but still involved in repulsion

Question 10

explain repulsion of lone pairs of electrons.

Answer 10

repulsion between lone pairs and bonding pairs is greater then that of 2 bonding pairs . 2 lone pairs have to strongest repulsion . bond angles decrease by 2