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15 August, 06:38

1. The horizontal columns on the periodic table are called

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Answers (2)
  1. 15 August, 06:50
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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. 15 August, 07:00
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    Answer: rows
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