What is the ionic charge of iron?
Either 3+ or 2+, depending on which compound it's in (the name of the compound will look like "iron(II) whateverelse" or "iron(III) whateverelse." Hope this helps! :D
Sulfur atoms are not in iron atoms. Sulfur atoms combine with iron atom by accepting excess electrons from the iron atoms. Iron atoms become iron ions with a positive charge. Sulfur atoms become sulfide ions with a negative charge. The opposite charges cause the oppositely charged ions to attract each other and form an ionic bond and, in the solid state, a crystal lattice structure.
Since it is an ionic compound, the overall charge should be zero. Iron (Fe) has possible different charges which are +2, and +3 however sulfide always has a charge of -2. Therefore, FeS is already balanced. When you write it, instead of writing "Iron Sulfide", you would write "Iron (II) Sulfide" this is because Iron has different charges and you must specify when you write it down.