Ionic solids are generally high melting.
Ionic solids are hard and brittle.
Ionic solids can be melted to form liquids that are an electrical conductors. Ionic solids that are water soluble, dissolve to form solutions that are electrical conductors. Why ionic substances are the way they are. Ionic solids are rigid because the multiple interactions between oppositely charged ions hold the charged particles in relatively fixed positions. Electrical conductivity depends on ions being able to move freely.