Final answer:
Solid sodium chloride crystals do not conduct electricity, but it conducts electric current when it is dissolved in water or melted.
Step-by-step explanation:
Table salt, or sodium chloride (NaCl), does conduct electric current when it is dissolved in distilled water or in its molten state. However, solid sodium chloride crystals do not conduct electricity. This is because the ions in the crystal lattice are held tightly together and cannot move freely to carry the current. It is only when the crystal lattice is broken apart, either by dissolving the salt in water or by melting it, that the ions are free to move and conduct electricity.