(D) The heaviest isotope of hydrogen is tritium ($^3_1H$ or $T$).The mass number $(A)$ is defined as the sum of the number of protons $(Z)$ and the nu

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(D) The heaviest isotope of hydrogen is tritium ($^3_1H$ or $T$).The mass number $(A)$ is defined as the sum of the number of protons $(Z)$ and the number of neutrons $(N)$.For tritium,the atomic number $(Z)$ is $1$ and the number of neutrons $(N)$ is $2$.Therefore,the sum of neutrons and protons is $N + Z = 2 + 1 = 3$.