Definition of Periodic table group
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Periodic table group Definition from Encyclopedia Dictionaries & Glossaries
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In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the standard periodic table, including the d-block elements, but excluding the f-block elements. The elements in a group have similar physical or chemical characteristic of the outermost electron shells of their atoms (i.e., the same core charge), as most chemical properties are dominated by the orbital location of the outermost electron. There are three systems of group numbering. The modern numbering group 1 to group 18 is recommended by the International Union of Pure and Applied Chemistry (IUPAC). It replaces two older naming schemes that were mutually confusing. Also, groups may be identified by their topmost element, like oxygen group (group 16) and some groups have a specific name, like chalcogen (group 16).
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