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  3. 9th Class
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  5. Structure of the Atom

9th Class Science Structure of the Atom Question Bank Atomic Structure IIT JEE Objective Problems

  • question_answer
    Number of protons, neutrons and electrons in the element\[_{89}{{\text{X}}^{\text{231}}}\]is

    A)  89, 89, 242                         

    B)  89, 142, 89

    C)  89, 71, 89                           

    D)  89, 231, 89

    Correct Answer: B

    Solution :

      Not Available


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