The Periodic Table shows the arrangement of elements in order of increasing atomic mass. ______, True, False, The Periodic Table divides elements into groups and periods. ______, True, False, A group is a horizontal row of elements. ______, True, False, There are 18 groups in the Periodic Table. ______, True, False, There are 10 periods in the Periodic Table. ______, True, False, Periods run from left to right. ______, True, False

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