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_{2}. I figured it was +2 since each oxygen atom carries an oxidation state of -1 (because it's a peroxide) and -1(2) is -2, so Ti must have an oxidation state of +2, right? But then when I try to ease my qualms, every single post on the Internet points toward an oxidation state of +4. I don't understand! Is this titanium peroxide or titanium dioxide? Any help would be greatly appreciated.