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In addition, groups may be idenitifed by the first element in each group-so the Group 16 elements is sometimes called the oxygen group. There is considerable confusion surrounding the Group labels.
The group number corresponds to the number of valence (or outer) electrons that the atom has. The atomic number of the element represents how many electrons the atom has in total. So if you do atomic number - number of valence electrons, you get the number of core electrons: Source(s): Chemistry major.