Describe how molecules form from individual elements. how and why can we predict which molecules will form?

Molecules form from individual elements by bonding to each other through the valence electrons. These electrons are the one responsible for bonding. Molecules form because these individual element atoms are not stable by themselves. Hope this answers the question.

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.