Step-by-step explanation
Ionic solids, such as sodium chloride (NaCl) are composed of positive and negative ions that are held together by electrostatic attractions, which can be quite strong.
Many ionic crystals also have high melting points. This is due to the very strong attraction between the ions.
Although they are hard they also tend to be brittle, and they shatter rather than bend. Ionic solids do not conduct electricity; however, they do conduct when molten or dissolved because their ions are free to move. Many simple compounds formed by the reaction of a metal and a nonmetal element are ionic.
Answer: b. Ionic