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28 February, 19:20

1. The horizontal columns on the periodic table are called

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  1. 28 February, 20:12
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    Periods

    Explanation:

    The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.
  2. 28 February, 22:29
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    Answer: rows
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