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4 March, 03:32

Periods on the periodic table are

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  1. 4 March, 06:32
    Periods on the periodic table of elements


    In the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families. (See also The Periodic Table: Metals, Nonmetals, and Metalloids.) In each period (horizontal row), the atomic numbers increase from left to right.
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