Final answer:
One atom of Fr-227 contains 87 protons, 87 electrons, and 140 neutrons, with the number of protons and electrons being equal to the atomic number,
Step-by-step explanation:
An atom of Fr-227 refers to the isotope of Francium with a mass number of 227. The number of protons in an atom is defined by its atomic number, and for Francium (Fr), this number is 87, which is the same for its electrons in a neutral atom. Knowing the mass number (227) and the number of protons,
we can calculate the number of neutrons by subtracting the atomic number from the mass number: 227 (mass number) - 87 (atomic number) = 140 neutrons. Therefore, one atom of Fr-227 contains 87 protons, 87 electrons, and 140 neutrons.and neutrons calculated by subtracting the atomic number from the mass number.