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atom with 2 protons and 4 neutrons
atom with 3 protons and 4 neutrons
atom with 4 protons and 4 neutrons
atom with 2 neutrons
atom with 4 protons
two protons and two neutrons
atom with protons neutrons and electrons
protons and neutrons in an atom
protons 4 neutrons and 3 electrons
what atom has 2 neutrons
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