# 6.7.1: Practice Shape

- Page ID
- 235960

Exercise \(\PageIndex{1}\)

Give the electron geometry and the molecule geometry of PCl_{3}. (The Lewis structure was on a previous practice page.)

**Answer**-
Electron geometry is tetrahedral (109.5° angle) because there are 4 electron regions around the central P atom.

Molecular geometry is pyramidal (also called trigonal pyramidal) because there are 3 atoms and 1 lone pair around the central P atom.

Exercise \(\PageIndex{1}\)

Give the electron geometry and the molecule geometry of H_{2}O.

**Answer**-
Electron geometry is tetrahedral (109.5° angle) because there are 4 electron regions around the central O atom.

Molecular geometry is bent because there are 2 atoms and 2 lone pairs around the central O atom.

Exercise \(\PageIndex{1}\)

Give the electron geometry and the molecule geometry of the nitrate ion (NO_{3}^{1–}). (The Lewis structure was on a previous practice page.)

**Answer**-
Electron geometry is trigonal planar (120° angle) because there are 3 electron regions around the central N atom.

Molecular geometry is trigonal planar because all 3 electron regions around the central N atom are atoms (no lone pairs).