Physics, 01.07.2019 09:00 oopsorry

Isotope a contains 56 protons and 80 neutrons. isotope b contains 55 protons and 81 neutrons. isotope c contains 57 protons and 80 neutrons. isotope d contains 56 protons and 74 neutrons. which isotopes have the same mass number?

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Isotope a contains 56 protons and 80 neutrons. isotope b contains 55 protons and 81 neutrons. isotop...