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Group may refer to:
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 periodic table, but the f-block columns (between groups 2 and 3) are not numbered. The elements in a group have similar physical or chemical characteristics 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 o
Two earlier group number systems exist: CAS ( Chemical Abstracts Service ) and old IUPAC . Both use numerals ( Arabic or Roman ) and letters A and B . Both systems agree on the numbers. The numbers indicate approximately the highest oxidation number of the elements in that group, and so indicate similar chemistry with other elements with the same numeral. The number proceeds in a linearly increasing fashion for the most part, once on the left of the table, and once on the right (see List of oxidation states