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One atom contains 29 protons and 34 neutrons. Another atom of the same element has a mass number of 65. How many protons and neutrons does this unknown atom have?.
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One atom contains 29 protons and 34 neutrons. Another atom of the same element has a mass number of 65. How many protons and neutrons does this unknown atom have?.

User Perraco
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The number of protons must be 29 because it’s the same element, so we subtract 29 from 65 to get the number of neutrons which is 36
User Kprobst
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