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Melting and boiling points of noble gases

Answer Text:
Melting and boiling points of noble gases
- Generally noble gases have very low melting and boiling points.
Reason:
- They exist as monoatomic gases with simple molecular structures with weak van der waals forces that are easy to break.
Trend:
- Melting and boiling points among the noble gases increase down the group.
Reason:
- Noble gases exist as monoatomic molecules and thus have simple molecular structures;
- The molecules (atoms) are held together by intermolecular (inter-atomic) 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.