Molecular geometry

Molecular geometry explains how atoms are arranged within the molecule.

Atoms tend to be as spaced and scattered as possible. Thus, they can acquire stability.

Molecular geometries are: linear, angular, planar trigonal, pyramidal, tetrahedral, octahedral, T-shape, trigonal bipyram, distorted tetrahedral or seesaw, planar square and quadratic base pyramid.

See the main molecular geometries below.


For diatomic molecules (with two atoms)

Polar - Different Atoms: HCl H - Cl
Apolar - equal atoms: H2 H - H

For triatomic molecules (with three atoms)

No leftover electrons from the central element. Nonpolar.

They form an angle of 180 °.

CS2 S - C - S

For triatomic molecules with leftover electrons. Polar.

They form an angle of 109 ° 28 '.

For tetratomic molecules without electron leftovers. Nonpolar.

For tetratomic molecules, left over from a pair of electrons. Polar.


For pentatomic molecules with central atom. Nonpolar.