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Compound Formula

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Write the formula for these compounds:
a) potassium sulfide
b) iodine heptafluride
c) iron(III)chromate

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Sulfide is a a combination of Sulfur atom(s) with oxidation number -2 with other elements.

Potassium is an alkali metal with one electron in the outer shell, Thus it has an oxidation number +1 (it is very happy to donate this electron)

To balance the compound (having total oxidation number 0) we need one sulfur (-2) and two potassiums (+1)

Thus (underscore denotes a subscript):

potassium sulfide is K_2S (metal first).

Iodine and Fluor are ...

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