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7 February, 20:09

1. The horizontal columns on the periodic table are called

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Answers (2)
  1. 7 February, 22:24
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    Answer: rows
  2. 7 February, 23:16
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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.
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