Behaves a little like a gas, but, because of the free electrons, they can be confined inside of a strong magnetic field. Made up of inert atoms or molecules that are neutral and do not bond with their neighbors. Individual atoms or molecules bounce off of their neighbors. A collection of atoms that has no fixed shape, but is able to maintain its volume. This is the source of surface tension.
Surface tension is the force that separates a liquid from the air.
Bonding is strong and directional. Subgroups are crystals, glasses, and polymers. E.g. gemstones, sand, salt. Most natural rocks are formed of interlocking smaller crystals. Your bones are crystalline.