Chemistry Unit 5

Summary of shapes

2 electron groups, 0 lone pairs

5 electron groups, 3 lone pairs

linear (180)

3 electron groups, 0 lone pairs

trigonal planar (120)

3 electron groups, 1 lone pair

bent (<120)

4 electron groups, 0 lone pairs

tetrahedral (109.5)

4 electron groups, 1 lone pair

trigonal pyramid (107)

4 electron groups, 2 lone pairs

bent (104.5)

5 electron groups, 0 lone pairs

trigonal bipyramid (90 and 120)

5 electron groups, 1 lone pair

see-saw (<90 and <120)

5 electron groups, 2 lone pairs

t-shape (90 and 180)

5 electron groups, 3 lone pairs

2 electron groups, 0 lone pairs

linear (180)

6 electron groups, 0 lone pairs

octahedral (90)

6 electron groups, 1 lone pair

square pyramid (<90)

6 electron groups, 2 lone pairs

square planar (90)

asymmetric shapes

bent, trigonal pyramid, see-saw, t-shape, and square pyramid (Bad Teachers See Troubled Students)

what are the exceptions to 8 electrons?

Be: 4, B, Pb, Sn: 6 (6 in. BLT)