(D) Tritium is an isotope of hydrogen represented as $_1^3H$.The atomic number $(Z)$ is $1$,which represents the number of protons.The mass number $(A

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(D) Tritium is an isotope of hydrogen represented as $_1^3H$.The atomic number $(Z)$ is $1$,which represents the number of protons.The mass number $(A)$ is $3$.The number of neutrons $(n)$ is calculated as $n = A - Z = 3 - 1 = 2$.Therefore,the nucleus of tritium contains $1$ proton and $2$ neutrons.