Because there is a large amount of empty space between gas molecules, the gas has the property

These gas molecules are much smaller than the distance between them.
So, most of the volume of a gas is therefore empty space.
There is no force of attraction between gas particles or between the particles and the walls of the container.
Because there is a large amount of empty space between gas molecules,the gas has property of low density.

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.