Correct Answer: Option A

Explanation

- When a metal melts or boils, this is a change of physical state. Energy is transferred to a substance to melt or boil it.

- an increase in temperature will increase the average kinetic energy of the molecules.

- This energy is needed to overcome the forces of attraction between the metal ions and the delocalize electrons in the metal. The more energy needed, the higher the melting point or boiling point .

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