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An atom contains 3 protons, 4 neutrons, and 3 electrons. what is its mass number
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An atom contains 3 protons, 4 neutrons, and 3 electrons. what is its mass number

User Sebastiaan Pouyet
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Because the atom contains 3 protons, it is Lithium. The isotope is specifically Lithium-7 but Lithium's average mass number is 6.941 amu.
User Chrystian
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