by 
Anonymous
ANSWERS: 3
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It's in what class it falls, metal, non-metal, or true elements... hope it helps
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Those roman numerals correspond to the oxidation state of the metal. If you have Ni(II) then you know nickel has an oxidation state of 2 and will combine with an anion of a total of -2 charge. This is the IUPAC naming convention for metals (see number 3). http://en.wikipedia.org/wiki/IUPAC_nomenclature_of_inorganic_chemistry
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Ahh! That is what I was thinking--but wasn't sure if it was a reference to valence d-electrons. Thanks!
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