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The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. what is the atomic mass of sodium?
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The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. what is the atomic mass of sodium?

User Luthfianto
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Atomic mass is the number of protons + number of neutrons. 11 protons + 12 neturons = 23
User Misha Brukman
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