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Sulfur belongs to the chalcogen family. Other members of the family are oxygen, selenium, tellurium, and polonium. These elements make up Group 16 (VIA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to each other.
Sulfate is a polyatomic SO4 ^2-. S is number 16 the rule is the 1st orbital can only hold 2 electrons ,then the rest can hold a max of 8 so the last orbital is the third for sulfur and it has the remaining 6 electrons. Also. So since sulfur S is in group 16 it has 6 valence electrons.