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<strong>Naming</strong> Cr 2 O 3To name Cr 2 O 31. Determine the charge of cation from the anion (O 2- ).2 Cr ions + 3 O 2- = 02 Cr ions + 3(2-) = 02 Cr ions - 6 = 02 Cr ions = +6Cr ion = 3+ = Cr 3+2. Name the cation by the element name <strong>and</strong> add aRoman numeral in parenthesis to show its charge.Cr 3+ = chromium(III)3. Write the anion with an ide ending.chromium(III) oxide = Cr 2 O 317
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