What is the mass number of the only radioactive isotope of hydrogen? | Hydrogen — Chem-Mantra | Chem-Mantra

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Question

What is the mass number of the only radioactive isotope of hydrogen?

Answer: 3

💡 Solution & Explanation

Tritium ($T$) is the only radioactive isotope of hydrogen. Its atomic nucleus contains $1$ proton and $2$ neutrons, yielding a mass number of $3$.

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