Lithium nitride has a high melting point, 813C. Nitrogen trifluoride has a low malting point, -207C.
Explain why the melting points are different? [2 marks]
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Lithium has high melting and boiling point due to its small size, due to which it possesses high ionisation energy. As a result the binding energy in its crystal lattice is very high. This is why lithium has high melting and boiling point.

Explanation:

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