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

  • question_answer
    What can be deduced from the symbol\[_{2}^{4}He\]?

    A)  An atom of helium contains two electrons.  

    B)  An atom of helium has two protons and four neutrons in its nucleus.

    C)  The proton (atomic) number of helium is four.

    D)  Helium acts as a diatomic molecule.

    Correct Answer: A

    Solution :

     In the nuclide\[_{2}^{4}He\], the atom has \[2\] protons and \[4-2=2\] neutrons. Since, the atom is neutral, the number of electrons = number of protons\[=2\].


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