Shapes Of Molecules

Question 1

What is the electron repulsion theory?

Answer 1

Electrons repel as far as possible

Lone pair to lone pair repulsion is greater than Lp to Bp which is greater than Bp to Bp

When there are no lone paired in a molecule, the bonded pairs repel equally

Question 2

How do you work out the number of lone pairs and bonded pairs of electrons ?

Answer 2

Find central atom and find its group number
And on the number of bonded atoms to the group number of central
Subtract positive charge or add negative charge
Divide by 2 to get number of electron pairs
Work out lone pairs by subtracting electron pairs from bonded pairs

Question 3

What bond angle does a tetrahedral and/or a pyramidal shape have?

Answer 3

Tetrahedral - 109.5

Pyramidal - 107

Question 4

What bond angle does a v/bend and/or trogons planar shape have?

Answer 4

V/bend - 104.5

Trigonal planar - 120

Question 5

What is the bond angle for a t shaped and/or trigonal bypyramidal shape?

Answer 5

T shaped - 86

Trigonal bypyramidal - 120,90

Question 6

What bond angle does a linear and/or modified trigonal bypyramidal shape have?

Answer 6

Linear - 180

Modified trigonal bypyramidal - 118,89

Question 7

What is the bond angle for octahedral and square planar?

Answer 7

90 for both