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An atom has 29 protons, 29 electrons, and 35 neutrons. What is the mass number of the atom?
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An atom has 29 protons, 29 electrons, and 35 neutrons. What is the mass number of the atom?

User Peladao
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The mass number will be 64 as to calculate the mass you add up the protons and neutrons.

Hope this helps!
User Bilel
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the mass number is 64
User Wmik
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