Get premium membership and access revision papers with marking schemes, video lessons and live classes.

Processing. Please wait.

Trend in melting and boiling points of halogens

Answer Text:
Trend in melting and boiling points.
- The melting and boiling points of halogens increase down the group.
Reason:
- Halogens exist as diatomic molecules and thus have molecular structures;
- The molecules are held together by intermolecular forces called the Van der Waals which have to be broken during melting and boiling;
- The strength of the Van der Waals increases as the size of the atoms and hence molecules increases which occurs down the group.
Summary on some physical properties of halogens