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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