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  5. Structure of the Atom

9th Class Science Structure of the Atom Question Bank Atomic Structure Formative Subjective Problems

  • question_answer
    Find the number of neutrons present in di-positively charged zinc ion with mass number 70.

    Answer:

    No. of neutron \[(n)=?\] Mass number of zinc \[(A)=70\] Atomic number of zinc\[(Z)=30\] We know that\[A=Z+n\Rightarrow n=AZ=7030\]\[=40\]. Note: During ion formation, only the number of electrons change but not the number of protons or neutrons.


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