Final answer:
Ionic compounds are usually solid at room temperature and have high melting and boiling points. They are not electrically conductive in solid form but can conduct electricity when molten or dissolved in solution.
Step-by-step explanation:
Ionic compounds are usually solid at room temperature. They have high melting points and boiling points compared to molecular compounds. For example, sodium chloride (NaCl) melts at 801°C and boils at 1413°C, while water (H2O), a molecular compound, melts at 0°C and boils at 100°C.
In solid form, ionic compounds are not electrically conductive because their ions are unable to flow. However, when molten or dissolved in solution, ionic compounds can conduct electricity because their ions are able to move freely.