Why do the melting and boiling points of the halogens increase going down Group 7?

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Question

Why do the melting and boiling points of the halogens increase going down Group 7?

Accepted Answer

The molecules become larger with more electrons, so the forces between molecules are stronger — Award 1 mark. Melting and boiling involve separating molecules from each other, not breaking the covalent bond inside each molecule, so it is the intermolecular forces that matter. All halogens remain diatomic throughout the group.

Answer

The molecules become more reactive further down the group

Answer

The molecules become larger with more electrons, so the forces between molecules are stronger

Answer

The molecules change from diatomic to monatomic

Answer

The covalent bonds within the molecules become stronger

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