when an electric field is applied to a metallic crystal, the movement of electrons is
Metal crystals refers to the metallic crystal structure of metals. When metals freeze and form a solid, the atoms actually form crystals. And this metallic crystal structure oâ¦f different metals and alloys has a profound effect on the strength and other physical properties of those materials.   Though mercury, copper, iron and tungsten are said to form metallic crystals, the idea can be expanded a bit to include metals in general.