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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.
https://m.youtube.com//watch?v=sJH7W7bGbWY
