main group elements are elements in groups (periodic columns) whose lightest members are represented by helium, lithium, beryllium, boron,carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements. Main group elements include elements (except hydrogen) in groups 1 and 2 (s-block), and groups 13 to 18 (p-block). Group 12 elementsare usually considered to be transition metals; however, zinc (Zn), cadmium (Cd), and mercury (Hg) share some properties of both groups, and some scientists believe they should be included as main group elements
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The representative elements are located in groups 1A to 7A. They are called representative elements because they display a wide range of physical and chemical properties.