Which one among the following elements is polyatomic ?

Atomicity is defined as the number of atoms present in one molecule of an element. Based on the number of atoms, elements are classified as monoatomic, diatomic, tetra-atomic, or polyatomic.

• Aluminium (Al): As a metal, it is considered monoatomic.
• Chlorine (Cl2): It exists as a diatomic molecule consisting of two atoms.
• Phosphorus (P4): It exists as a tetra-atomic molecule.
• Sulphur (S8): It exists as a molecule containing eight atoms joined together in a ring. In standard chemistry textbooks (like NCERT), while Phosphorus is specifically called tetra-atomic, Sulphur is the primary example of a polyatomic element.

Since Sulphur consists of more than four atoms in its molecular structure, it is categorized as polyatomic, making Option B the correct answer.