Polyatomic molecules are made up of more than three atoms.
Definition for atomicity
The number of atoms present in a molecule of an element is known as the atomicity of that element. Based on the atomicity, molecules can be monoatomic, diatomic, triatomic or polyatomic.
Monoatomic molecules: molecules of some elements consist of only one atom
Example-helium(), neon()
Diatomic molecule-:The molecules of certain elements consist of two atoms of the same element.
Example-oxygen(), chlorine()
Triatomic molecules: The molecules of certain elements consist of three atoms of the same element.
Example-ozone()
Polyatomic molecule: The molecules made up of more the three atoms are called polyatomic molecules
Example: phosphorus()
Therefore the given statement is true, ie, polyatomic molecules are made up of more than three atoms.