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    Question

    Which of the following pair of element тАУ atomicity is

    correct? I. Helium тАУ monoatomic II. Oxygen тАУ triatomic
    A Only II Correct Answer Incorrect Answer
    B Both I and II Correct Answer Incorrect Answer
    C Only I Correct Answer Incorrect Answer
    D Neither I nor II Correct Answer Incorrect Answer

    Solution

    Helium (He) is an inert gas. Inert gases exist as a monoatomic. Triatomic oxygen (ozone, O3) is a very reactive allotrope of oxygen that is a pale blue gas at standard temperature and pressure

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