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Given the atomic number and the atomic mass, how can you figure out the number of protons, neutrons, and electrons in a given element.
# of protons: The atomic number is the number of protons.
# of electrons: The atomic number is the number of electrons (number of protons = number of electrons)
# of neutrons: The atomic mass minus the atomic number (number of protons) because the number of protons + number of neutrons = atomic mass.