In chemistry and atomic physics, main group elements are elements in groups, (periodic columns) whose lightest members are represented by hydrogen, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and helium as arranged in the periodic table of the elements. Main group elements include elements in groups 1A- 2A and 13 (3A) - 18 (8A) (also known as S and P block elements). Group 12 elements are 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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