Question

Define atomicity & state the atomicity of phosphorus; carbon dioxide; sulphur and water

Answer 1

phosphorus 4
carbon 1
sulphur 1
water 3

Answer 2

Atomicity - The number of atoms in a molecule of an element is called it's Atomicity.
Tetratomic molecules - phosphorus as it has 4 atoms in its molecule.
Octatomic molecules - Sulphur as it has 8 atoms in its molecule.