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Groups are the vertical columns on the table and they represent how many valence electrons the elements in th group have. There are 8 groups, from Hydrogen to Helium (metals aren't included because they can have a various number of valence electrons; they are identified in a different way, in the B category). The groups are A1, A2, A3, A4, A5, A6, A7, and A8. Simply, elements in group

A1 have 1 valence elctron, group A2 have two, so on..

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