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How many protons are in the nucleus of an atom that has an atomic number of 23 and a mass number of 51? (answer quick please)
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How many protons are in the nucleus of an atom that has an atomic number of 23 and a mass number of 51? (answer quick please)

User Casper Kuethe
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The atomic number is the number of protons, so this atom has 23 protons.

User Kareen Lagasca
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