write the formulas and give the names of the compounds formed by the following ions a) Cr^2+ and F^- b) Ni^2+ and O^2 and c) Fe^3+ and O^2-

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  1. CrF2
    Do you know how to do these? If not you need to learn to do them. You want to make the subscripts (which we don't write as subscripts on these boards--that is, we make them as in CrF2 in which the 2 is understood to be a subscript.) so that the charges on the two ions add to zero. For example, Cr+2 and 2F ad -1 each will give CrF2. For Ni at +2 and O and -2, NiO would be neutral. etc.

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