University:
Carleton University
Course:
CHEM 1001 | General Chemistry I
Academic year:

2024
Views:

373

Pages:

3
Author:

ali

Three regions of e- density (AX3, AX2E) Electron pair geometry and molecular geometry are not necessarily the same. NO3- O=N=O O AX3 trigonal planar BF3 F | F-B-F | F AX3 trigonal planar SO2 O=S=O AX2E bent NO2- O-N=O AX2E bent Electron pair geometry is still trigonal planar ↓ molecular geometry is not! → lone pairs take up more space & bends bonds! Four regions of e- density (AX4, AX3E, AX2E2) Electron pair geometry and molecular geometry are not necessarily the same. CH4 H | H-C-H | H AX4 tetrahedral → mol geo NH3 H | H-N-H | H AX3E trigonal pyramidal / mol geo pyramidal → mol geo e pair geo is tetrahedral Five regions of e- density (AX5, AX4E, AX3E2, AX2E3) Electron pair geometry and molecular geometry are not necessarily the same. PF5 F | F-P-F | F AX5 trigonal bipyramidal SF4 F | F-S-F | F AX4E See-Saw → mol geo Most energetically favorable is to convert an equatorial atom into a lone pair. Keeps lone pair as far away as possible. e- pair geo is trigonal bipyramidal.