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taskmasters
I believe the correct answer from the choices listed above is the second option. If an oxygen atom has 8 protons and 10 neutrons in its nucleus, then its atomic number would be 8. The atomic number is the number of protons in the nucleus of an atom. Hope this answers the question.
moedlmichele

if an oxygen atom has 8 protons and 10 neutrons in its nucleus it's atomic number is 8