Shapes of Molecules

A,B,C

A = Total electron domains

B = Number of bonding domains

C = Number of lone (non-bondng) pairs

3,3,0

Trigonal Planar - 120^o

2,2,0

Linear - 180^o

3,2,1

Bent/ V-Shaped - 120^o

4,1,3

Linear - no bond angle because there is only 1 bond

4,4,0

Tetrahedral - 109^o

4,3,1

Trigonal Pyramidal - 109^o

4,2,2

Bent/ V-Shaped - 109^o

Symmetrical Shapes

Tetrahedral

Trigonal Planar

Linear (2 regions)

(These are the base shapes)

Repulsion Statement

These regions repel to the maximum extent possible

H & B

Atoms “happy” with less than an octet (8 e-)

Polar bonds form due to…

A difference in electronegativity