Q

# Why is dioxygen a gas but sulphur a solid?

7.18     Why is dioxygen a gas but sulphur a solid?

Oxygen is smaller in size as compared to the sulphur. Thus it can effectively form $p\pi-p\pi$ bond and form $O_{2}(O=O)$ molecules. The intermolecular forces in oxygen are weak van der Wall's, which cause it to exist as gas.whereas sulphur exists as a puckered structure held together by strong covalent bonds. Hence, it is solid.