Explain why neither liquids nor gases have a shape

Their molecules are constantly in motion, which is why they spread according to the shape of the container and don't have a shape of its own.

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.