Three isotopes of Carbon are shown above. How are these isotopes alike? A. They have the same number of protons and the same mass number. B. They have the same number of neutrons and the same mass number. C. They have the same number of neutrons and the same atomic number. D. They have the same number of protons and the same atomic number.
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A. They have the same number of protons and the same mass number.
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