2.2.13 expansion of the octet

why can elements in period 3 onwards have the possibility of having more than 8 electrons in valence shell

becuase is a d subshell that can accomadate extra electron pairs

PCl5

ED?

BP?

LP?

EDG?

MG?

5 electron domains

5 BP 0 KO

EDG and MG trigonal bipyramidal 90 & 120

SF4

ED?

BP?

LP?

EDG?

MG?

5 ED

4 BP 1 LP

EDG trigonal bipyramidal 90 and 120

MG see saw, <90 and <120

ClF3

ED?

BP?

LP?

EDG?

MG?

5 ED

3BP 2LP

EDG trigonal bipyramidal 90 and 120

MG T shaped, less than 90

I3-

ED?

BP?

LP?

EDG?

MG?

5 ED

3 BP 3 LP

EDG trigonal bipryamdial 90 and 120

MG linear 180

SF6

ED?

BP?

LP?

EDG?

MG?

6 ED
6BP 0LP

EDG and MG octahedral 90

BrF5

ED?

BP?

LP?

EDG?

MG?

6 ED

5 BP 1 LP

EDG octahedral 90

MG square pyramidal <90

XeF4

ED?

BP?

LP?

EDG?

MG?

6 ED

4BP 2 LP

EDG octahedral 90

MG square planar 90

what does molecular geometry refer to

shape of the molecules based on the relative orientation of the atoms w

what is the EDG

relative orientation of all BP and LP

5 ED summary table

6 ED summary table