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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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