A crystal and its melt readily conduct electricity.The crystal also has a luster and is easily deformed.Thus,it is:

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Quizplus · Accepted Answer

The given properties suggest that the crystal is a metallic crystal. The ability to conduct electricity and have a luster are indicative of metallic bonding, where delocalized electrons are responsible for the conductivity and the shiny appearance. The ability to be easily deformed also supports this hypothesis as metals are malleable and ductile due to the mobility of the atoms in their crystal lattice. Covalent network crystals, ionic crystals, and molecular crystals also have unique properties that differentiate them from metallic crystals.

A Crystal and Its Melt Readily Conduct Electricity