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The nucleus of a hydrogen atom (specifically, the most common isotope, protium, 1H) has an atomic number of 1 and a mass number of 1. This means it contains one proton and no neutrons. Ele

Chemistry

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A\text{A}

The nucleus of a hydrogen atom (specifically, the most common isotope, protium, 1H^{1}\text{H}) has an atomic number of 1 and a mass number of 1. This means it contains one proton and no neutrons. Electrons orbit the nucleus and are not part of it.

Therefore, the nucleus of a hydrogen atom consists of one proton only.

The final answer is A\text{A}.

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