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what do groups and periods tell us what do groups and periods tell us on the periodic table what do groups and periods tell you what does the group and period tell you about an element what do group numbers and period numbers tell us what are groups and periods used for on the periodic table what does the group number and period tell you about the element what does the group and period number tell you what does the group and period numbers tell you from the periodic table what does the group number and period number tell us
