The p-Block Elements
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Why the melting and boiling points of halogens increases in going from top to the bottom of the group?

All the halogens are diatomic molecules. The forces of attraction are weak Van der Waals forces. The strengths of these forces depends on the surface area which in turn depends on the molecular mass. Down the group, molecular mass and surface area increases, hence melting and boiling points increases down the group.
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