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      Question

      Which of the following statements about the modern

      periodic table is NOT correct?
      A There are seven periods in the periodic table Correct Answer Incorrect Answer
      B Period 1 has only one element Correct Answer Incorrect Answer
      C The periodic table is arranged in order of atomic number Correct Answer Incorrect Answer
      D There are 18 groups in the periodic table Correct Answer Incorrect Answer

      Solution

      The statement that is NOT correct is: Period 1 has only one element Period 1 of the periodic table actually has two elements: Hydrogen (H) and Helium (He).

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