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      Question

      Find the odd one

      out.
      A Neon Correct Answer Incorrect Answer
      B Argon Correct Answer Incorrect Answer
      C Helium Correct Answer Incorrect Answer
      D Hydrogen Correct Answer Incorrect Answer

      Solution

      Except for Hydrogen, all are noble gases. The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radioactive radon (Rn).

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