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

A. Linear

B. Bent

C. Trigonal planar

D. Tetrahedral

The simplest system for geometrical shapes that focuses on the number of **electron groups** around the central atom.

Concept #1: Understanding 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}.

A. Linear

B. Bent

C. Trigonal planar

D. Tetrahedral

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}^{+}.

A. 2

B. 3

C. 4

D. 1

Practice: Draw and determine the electron geometry for the following molecule: TeBr_{4}

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

A. Linear

B. Trigonal Pyramidal

C. Tetrahedral

D. Trigonal Planar