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6 December, 00:16

Periods on the periodic table are

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  1. 6 December, 00:40
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    Periods on the periodic table of elements

    Explanation:

    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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