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.