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I think it's always nice to remember those "essential" ones, like how free elements always have 0, oxygen is typically 2- in compounds, hydrogen is 1+, or ox number typically equals charge of a monoatomic ion. There's ~5 more I believe, so I think having the idea behind those wouldn't be bad too. Not sure how Lavelle would present those on a test; I'll guess we'll probably have to memorize them like the rules for coordination compounds.
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