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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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    https://brainmass.com/chemistry/oxidation-reduction-and-electrochemistry/compound-formula-32677

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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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