Radio waves, heat and light are not matter since they have no mass. A maximum-boiling mixture is an azeotrope having a boiling point higher than those of its components. Melting Melting is the process by which a solid changes state from a solid to a liquid. Melting Point Melting point is the temperature at which a substance change state from being solid to being liquid. Metal A metal is an element which has the physical properties of having a lustrous appearance, being malleable, being tenacity, having high densities, and being good conductors of heat and being good conductors of electricity.
Metals react with oxygen to form basic oxides.
Metals react with halogens to form halogen compounds which are stable in presence of water. Metals are electro-positive elements and form complex salts. Many metallic chlorides liberate chlorine when treated with sulphuric acid and manganese dioxide. Many metallic chlorides liberate hydrogen chloride gas when warmed with concentrated sulphuric acid. The atoms in a metal are arranged in an orderly manner.