Practice: Determine the electron geometry for the carbon disulfide molecule, CS_{2}.

**Electron Geometry** is the simplest system for geometric shapes.

Concept #1: Electron Geometry

The **electron geometry **of a compound treats surrounding elements and lone pairs on the central element as the same.

Example #1: Determine the electron geometry for the hydrogen sulfide molecule, H_{2}S.

Practice: Determine the electron geometry for the carbon disulfide molecule, CS_{2}.

Example #2: Determine the electron geometry for the following molecule: CH_{2}O.

Practice: Determine the number of electron groups for the following cation: AsBr_{2}^{+}.

Practice: Determine the electron geometry of the nitrogen atom within methylamine, CH_{3}NH_{2}.