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If we're considering 23Na (atomic number 11), the stable isotope, the answer to your question would be 11 protons (atomic number) and 12 neutrons (sodium's mass is about 23, 23-11=12).

Note of other isotopes only the number of neutrons change and that change can be observed by looking at the number in superscript (the 23 in front of sodium), subtract the 11 protons and you will know the amount of neutrons in the other isotopes.

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