Element in family 9, period 4, Mg, Co, Mt, Element in family 18, period 1, H, He, Lr, Se location?, Family 4, Period 16, Family 16, Period 3, Family 16, period 4, Families are also called..., rows, groups, periods, How many periods are on the periodic table?, 18, 7, How many families are on the periodic table?, 8, 18, 7, Elements that are grouped together in a ____ will have several properties in common., family, row

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