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The periodic table: families periods - dummies, In periodic table elements, horizontal rows elements called periods. vertical columns elements called groups, families. (. http://www.dummies.com/education/science/chemistry/the-periodic-table-families-and-periods/ About chemistry: chemistry projects periodic tables, Put lab goggles start learning chemistry resources. find instructions chemistry experiments learn chemical reactions, elements. https://www.thoughtco.com/chemistry-4133594