Problem: Give the systematic names for the formulas or the formulas for the names of the following compounds:
(a) Tin(II) fluoride (b) CrI 3 (c) Iron(III) oxide (d) MnS
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Solution:
(a) Tin(II) is Sn 2+; fluoride is Fñ . Two Fñ ions balance one Sn2+ ion; therefore tin(II) fluoride is SnF2 .
(b) The anion is Iñ , iodide, and the formula shows three Iñ so the cation must be Cr 3+ , chromium(III): CrI3 is chromium(III) iodide.
(c) Iron(III), Fe 3+ ; oxide ion is O2ñ . To balance the ionic charges, the formula must be Fe2O3.
(d) The anion is sulfide, S2ñ , which requires that the cation be Mn2+. So the name is manganese(II) sulfide.
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