Question

Why sulphur need 8 atoms to become a molecule?

Answer 1

So the atomicity of oxygen is 2 and therefore it is a diatomic gas. Some solid elements like phosphorus and sulphur have more than two atoms in their molecules. ... Sulphur molecules consist of eight atoms per molecule. Its atomicity is 8 and so it ispolyatomic.

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Answer 2

atomicity of a element is described as the no of atoms present in an element to make  it stable

the sulphur is having atomicity 8 because it exists in two states S6 and S8