Metals like potassium, calcium and sodium have low melting and boiling points.

The correct option is A True

Melting point: The melting point is usually defined as the point at which materials change from a solid to a liquid.

Boiling point: The boiling point is the temperature at which the vapour pressure of a liquid equals the external pressure surrounding the liquid.

• In general, metals have high melting and boiling point. It's because the atoms in metals are closely packed.
• So, they need more energy to move them apart and convert them into liquid.
• But metals like $\mathrm{Sodium}\left(\mathrm{Na}\right),\mathrm{Potassium}\left(\mathrm{K}\right),\mathrm{and}\mathrm{Calcium}\left(\mathrm{Ca}\right)$ are exceptions because these metals have a low melting point.

Thus, the given statement is True i.e., Metals like potassium, calcium, and sodium have low melting and boiling points.