February 22, 2017

Homework Help: chem

Posted by mike on Sunday, October 25, 2009 at 9:13pm.

DrBob222, thank you for answering my question(s). Sorry for asking repeatedly, I am new to this "posting" stuff. I thought I was asking different persons. Let me rephrase my question. How do I determine which roman numeral to place between the cation and the anion of a metal-nonmetal substance? I think that there must be a rule of thumb that would tell me how VCl3 ends up being Vanadium (III) Chloride and how CrO2 ends up being Chromium (IV) oxide. There must be some kind of relationship between the charges of each element. But I just can't figure out what it is and how to apply it. Can you help me, please?

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