Element (Element) is a pure substance that contains only one type of atom such as sodium (Na), magnesium (Mg) and carbon (C) and oxygen (O), etc. To organize the elements into the category relies on similar properties of each type of element is used as the criteria, such as ferrous and non-ferrous metals as a criterion. Divide into 3 groups: metals, ferrous and non-ferrous metals and semi can also break that into smaller groups, including the Group 3. such other subordinate groups using the State as a criterion for agility and reaction characteristics at normal temperature, etc. The diagram we divide that into 3 types: Metal (Metal) Non-ferrous metals (Non-metal) Cross metals (metal Metalloid, or Semi)
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