AP Chemistry Geometric Shapes

KMS

2 Electron Domains

Any bond atoms that have two electron domains. They form 180 degree angles. Example: CO2

Shape: Linear

3 Electron Domains

Any bond atoms that have three electron domains. These electron domains from 120 degree angles.

Example: BF3

Shape: Trigonal 

Any bond atoms that have 2 bonded electron domains and one lone pair domain. 119 degrees.

Example: SO2

Shape: Bent

4 Electron Domains

Any bond atoms that have 4 electron domains that are bonded. These electron domains form 109.5 degree angles.

Example: CH4

Shape: Methane

Any atoms that have 3 electron domains that are bonded, and one lone electron domain on the central atom. These electron domains form a little less than 109.5 degree angles.

Example: NH3

Shape: Trigonal Pyramidal

Any atoms that have 2 electron domains that are bonded, and two lone electron domains on the central atom. These form a little less than 109.5 degree angles as well. 

Example: H2O

Shape: Bent

5 Electron Domains

Any bond atoms that have 5 bonded electron domains. They form 120 degree and 90 degree angles.

Example: PF5

Shape: Trigonal Bypyramidal

Any bond atoms that have 4 bonded electron domains and one lone pair. They form 90, 120, and 180 degree angles. 

Example: SCl4 

Shape: Seesaw 

Any bond atoms that have 3 bonded electron domains and two lone pairs. They form 90 degree angles. 

Example: ClF3

Shape: T-pose

Any bond atoms that have 2 bonded electron domains and three lone pairs. 180 degree angles. 

Example: XeF2

Shape: Linear