Sodium azide NaN3 has a high melting point. Predict the type of bonding in a crystal of sodium azide. Suggest why its melting point is high. (3)

There is ionic bonding because Na is a metal and N is a non metal, so there is a strong electrostatic attraction between the oppositely charged ions Na⁺ and the N₃^-1This means that lots of energy is required to overcome the strong forces of attraction, which is why there is a high melting point.