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huh Calcium oxide? I'm afraid yo0u are looking for the name of the cation and not the whole compound! The cation in Calcium oxide is Calcium ion. The cation in iron(ii)nitrate is iron(ii) ion! Remember that all number in IUPAC should be in Roman Numerals and the name of the species is not the same as the name of the cation or anion in the species...!!! Lemme know if you want the answers for the rest as well.
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