In chemistry and atomic physics, 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 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.
In older nomenclature the main group elements are groups IA and IIA, and groups IIIB to 0 (CAS groups IIIA to VIIIA).
Main group elements (with some of the lighter transition metals) are the most abundant elements on the earth, in the solar system, and in the universe. They are sometimes called the representative elements.
Other articles related to "group, groups, element, main group element, elements":
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... In mathematics, given two groups (G, *) and (H, ·), a group homomorphism from (G, *) to (H, ·) is a function h G → H such that for all u and v in G it ... From this property, one can deduce that h maps the identity element eG of G to the identity element eH of H, and it also maps inverses to inverses in the sense ... A more recent trend is to write group homomorphisms on the right of their arguments, omitting brackets, so that h(x) becomes simply x h ...
... For a main group element, the number of valence electrons that it may have depends on the electron configuration in a simple way ... For a main group element, a valence electron is defined as an electron that resides in the electronic shell of highest principal quantum number n ... For zinc (and succeeding elements), the 3d subshell is complete and a 3d electron is considered to be a core electron ...
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