very good conductors of heat and electricity. very malleable and can be rolled into sheets and such and not break. and are also ductile, which means they can be made to form wires!
Metals are sometimes described as a lattice of positive ions surrounded by a cloud of delocalized electrons. They are one of the three groups of elements as distinguished by their ionization and...
Not always. For example sodium (Na), a metal that reacts violently with water, and chlorine (Cl), a yellow poisonous gas, combine to make table salt, which has none of these properties. But in others...