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  3. 9th Class
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  5. Atoms and Molecules

9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    Select the relation between atomic number, mass number and number of neutrons.

    A) Mass number = atomic number + number of neutrons

    B) Mass number = atomic number/number of neutrons

    C) Mass number =atomic number \[\times \] number of neutrons

    D) Mass number = atomic number - number of neutrons

    E) None of these

    Correct Answer: A

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