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  5. Structure of the Atom

9th Class Science Structure of the Atom Question Bank Structure of the Atom

  • question_answer
    An isotope of helium is represented by the symbol\[_{2}^{3}He\]. How many protons, neutrons and electrons are there in an atom of the isotope?

    A)
    Protons Neutrons Electrons
    1 2 1

    B)
    Protons Neutrons Electrons
    1 3 2

    C)
    Protons Neutrons Electrons
    2 1 2
     

    D)
    Protons Neutrons Electrons
    2 3 2

    Correct Answer: C

    Solution :

     Given,\[Z=2;\,\,A=3\] \[Z=\] number of protons \[=\] number of electrons\[=2\] Number of neutrons\[=A-Z=3-2=1\]


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