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What is the mass number of an atom of 5 protons and 7 nuetrons

What is the mass number of an atom of 5 protons and 7 nuetrons
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What is the mass number of an atom of 5 protons and 7 nuetrons

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User Gabrielstuff
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7 + 5 = 12. But there is also electrons, and there is an equal amount. The atomic mass is 17.
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User Joe Hany
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