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An atomic model shows 19 protons, 20 neutrons, and 19 electrons. What is the mass number of the atom?

An atomic model shows 19 protons, 20 neutrons, and 19 electrons. What is the mass number of the atom?
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An atomic model shows 19 protons, 20 neutrons, and 19 electrons. What is the mass number of the atom?

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User Blue Lovag
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1 Answer

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the mass number of the atom is 39
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User Jialin Wang
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