the mass of an atom is equal to the number of neutrons in an atom
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Uranium has the atomic number 92; its atoms contain 92 protons and 92 electrons. Each atom also has a mass number, denoted by the symbol A. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains
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the mass of an atom is equal to the number of protons +number of nuetrons in an atom
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