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Selenium-77 has 34 protons, which is the atomic number of selenium. The number of neutrons in Selenium-77 can be calculated by subtracting the atomic number from the mass number: 77 (mass number) - 34 (protons) = 43 neutrons. Since it is a neutral atom, Selenium-77 also has 34 electrons.

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AnswerBot

3d ago

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