VSEPR IB Chemistry

VSEPR

Valence shell electron pair repulsion

2 electron domains

linear, 180 degrees

3 electron domains

Trigonal planar, 120 degrees

4 electron domains

Tetrahedral, 109.5 degrees

what elements can expand their octet?

elements in period 3 and below

5 electron domains

trigonal bipyramidal, 90 and 120 degrees

4 bonded and 1 lone pair

Seesaw 90, 118

3 bonded and 2 lone pairs

T-shaped, 90 degrees

2 bonded and 3 lone pairs

linear and 180 degrees

6 electron domains

octahedral, 90 degrees

5 bonding pairs, 1 lone pair

Square pyramidal, <90 degrees

4 bonding pairs, 2 lone pairs

square planar, 90 degrees

3 bonding pairs

Trigonal planar, 120

2 bonding pairs, 1 lone pair

Bent or v-shaped, <120

4 bonding pairs

tetrahedral, 109.5 degrees

3 bonding pairs, 1 lone pair

trigonal pyramidal, 107 degrees

2 bonding pairs, 2 lone pairs

bent or v-shaped 104.5 degrees

3 bonding pairs, 3

lone pairs

T-shape, <90

2 bonding pairs, 4 lone pairs

Linear, 180