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    Question

    The line spectra of two elements are not identical

    because-
    A they have different mass numbers. Correct Answer Incorrect Answer
    B the elements do not have the same number of neutrons Correct Answer Incorrect Answer
    C their outermost electrons are at different energy levels Correct Answer Incorrect Answer
    D Both 1 & 2 Correct Answer Incorrect Answer

    Solution

    The correct answer is C

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