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mass number is the number of protons and neutrons in the nucleus of an isotope . how many protons in an oxygen-18 atom ?
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mass number is the number of protons and neutrons in the nucleus of an isotope . how many protons in an oxygen-18 atom ?

User Cashe
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Answer: Oxygen - 18 atom contains 8 protons.

Step-by-step explanation:

The number of protons is the same as the atomic number. In isotopes, only the neutrons vary, but the protons always remain the same.

User CeejeeB
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