Metal & Metal Compounds
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A metal is generally regarded as any substance capable of conducting electricity at a temperature of absolute zero. In astrophysics metal is referred to as all chemicals in a star that are heavier than the latest to hydrogen and helium. Metals make up 25% of the Earth's crust and are used in many aspects of everyday life. Humans began to use metal about 11,000 years ago.
Metals can be divided into two groups - ferrous metals contail iron and non-ferrous metals contain no iron.