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Wikipedia definition
1. Group (periodic table)In chemistry, a group (also known as a family) is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table, including the d-block elements, but excluding the f-block elements. The explanation of the pattern of the table is that the elements in a group have similar physical or chemical characteristic of the outermost electron shells of their atoms (i.e.
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