--- What ion will be formed by the sulfur atom shown below when it has a stable set of
valence electrons or it satisfies the octet rule?

Sulfur has an atomic number 16 and is found in group 16 of the periodic table. Sulfur’s valence shell is 3p4 and in order to be have a stable set of valence electrons, the valence orbital needs to have 6 electrons in it. In order to reach its octet, sulfur needs to gain 2 electrons. The ion that will form when sulfur gains the electrons is S2-.