Final answer:
Oxygen-15 contains 8 protons, while hydrogen's most common isotope has 1 proton and no neutrons.
Explanation:
Oxygen-15 is an isotope that contains 8 protons based on the information provided. The atomic number of an element indicates the number of protons in its nucleus. In the case of hydrogen, the most common isotope, known as protium, has only one proton and no neutrons.
Learn more about Isotopes and Protons here:
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