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QUESTION

For silver sulfide...Do I write the chemical formula like so: AgS?

No. The formula for silver sulfide is "Ag"_2"S".

Silver ions have a charge of 1^+ and sulfide ions have a charge of 2^-. The overall charge of silver sulfide must be zero. So for every sulfide 2^- ion there must be two silver 1^+ ions.

The video below shows how to use a technique called the crisscross method to determine the formula unit for an ionic compound.