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How many neutrons does element X have if its atomic number is 33 and its mass number is 80?
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How many neutrons does element X have if its atomic number is 33 and its mass number is 80?

User Singingfish
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The number of neutrons is equal to the atomic mass, or mass number, minus the atomic number:
80 - 33 = 47 neutrons.
User Tobuslieven
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