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Metal is a glossy (that is, a strong reflection of visible light), full of ductility, easy to conduct electricity, thermal conductivity and other properties of the material. The above properties of metals are related to the free electrons contained in metal crystals. In nature, the vast majority of metals exist in a synthetic state, and a few metals, such as gold, platinum, silver and bismuth, exist in a free state. Most metal minerals are oxides and sulphides. Other forms of presence are chloride, sulfate, carbonate and silicate. The link between the metals is a metal bond, so the random replacement position can re-establish the link, which is why the metal ductility is good. Metallic elements usually show only positive prices in compounds. The relative atomic mass is called heavy metal.