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A metal is a substance with a sheen (that is, strongly reflected by visible light), malleable, electrically conductive, and heat conducting. All of the above properties of metals are related to the free electrons in the metal crystals. In nature, most metals exist in a compound state, and a few metals, such as gold, platinum, silver and bismuth, exist in free form. Most of the metal minerals are oxides and sulfides. Other forms of existence are chlorides, sulfates, carbonates, and silicates. The bonds between the metals are metal keys, so they can be renewed at any change of position, which is why the metal is well stretched. A metallic element usually only shows a positive valence in a compound