A 0.682 g sample of aluminum metal was reacted with dilute sulfuric acid and the hydrogen evolved was collected over mercury at a barometric pressure of 737 torr and a temperature of 22 degrees C. What volume of hydrogen gas was collected

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.