Why is dioxygen gas but sulphur a solid?

Explanation

Oxygen has small size and high electronegativity . If forms `p pi - pi pi` double bonds , O = O . The inter - molecular forces are weak forces . Hence , oxygen in a gas. Where sulphur does not form stable ` p pi - p pi` bonds and does not exist as `S_(2)` molecule . It from `S_(8)` molecules with pucked ring structure . Thus, each molecule contains 8S atoms linked by S-S bonds . Thus, S atoms are stongly held and sulphur is soild.