(C) The nucleus of a helium atom is represented as $_2He^4$. This notation indicates that the atomic number $(Z)$ is $2$,which corresponds to the numb

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(C) The nucleus of a helium atom is represented as $_2He^4$. This notation indicates that the atomic number $(Z)$ is $2$,which corresponds to the number of protons. The mass number $(A)$ is $4$. The number of neutrons $(n)$ is calculated as $A - Z = 4 - 2 = 2$. Therefore,the nucleus contains $2$ protons and $2$ neutrons.