VSEPR (electron domain geometries, molecular geometries, bond angles)

electron domain

The region in which electrons are most likely to be found (bonding and nonbonding). A lone pair, single, double, or triple bond represents one region.

electron domain geometry

the arrangement of electron domains around the central atom

molecular geometry

The arrangement of atoms determined by the arrangement of bonding electron pairs and lone pairs around the central atom in a molecule.

linear (180º)

2 electron domains, 0 lone pairs

trigonal planar (120º)

3 electron domains, 0 lone pairs

bent/angular (≈117.5;

3 electron domains, 1 lone pair

tetrahedral (109.5º)

4 electron domains, 0 lone pairs

trigonal pyramidal (≈107º;

4 electron domains, 1 lone pair

bent/angular (105º;

4 electron domains, 2 lone pairs

trigonal bypyramidal (120º equatorial; 180º axial; 90º between axial and equatorial)

5 electron domains, 0 lone pair

see-saw (180º axial; ≈117º/

5 electron domains, 1 lone pair

T-shaped (180º axial; ≈88º/

5 electron domains, 2 lone pairs

linear (180º axial)

5 electron domains, 3 lone pairs

octahedral (90º)

6 electron domains, 0 lone pair

square pyramidal (

6 electron domains, 1 lone pair

square planar (90º)

6 electron domains, 2 lone pairs