Atomicity is the combining capacity of an element.
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.
Valency:
Valency is defined as the combining capacity of an element.
Example-Valency of hydrogen (H) is 1, and magnesium (Mg) is 2.
Therefore the given statement is false. i.e, atomicity is the combining capacity of an element.