Interpret the following equation for a chemical reaction using the coefficients given: H2(g) + Cl2(g) 2HCl(g)
On the particulate level:
of H2(g) reacts with of Cl2(g) to form two molecules of HCl(g).
On the molar level:
of H2(g) reacts with of Cl2(g) to form two moles of HCl(g).

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.