question: An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?
choices.text: 50 protons, 69 electrons, 50 neutrons 50 protons, 50 electrons, 69 neutrons 69 protons, 50 electrons, 69 neutrons 69 protons, 69 electrons, 50 neutrons
choices.label: A B C D