Define isotopes as different atoms of the same element that have the same number of protons but different numbers of neutrons

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Isotopes are defined as atoms of the same element with the same number of protons but different numbers of neutrons. Based on this, which pair of atoms are isotopes of the same element?

• A Atom A: 6 protons, 6 neutrons | Atom B: 7 protons, 6 neutrons
• B Atom A: 17 protons, 18 neutrons | Atom B: 18 protons, 17 neutrons
• C Atom A: 8 protons, 8 neutrons | Atom B: 8 protons, 10 neutrons
• D Atom A: 11 protons, 12 neutrons | Atom B: 12 protons, 12 neutrons

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