Luckily, the chemical name calculator remembers them for you! MnBr₃ would be called manganese(III) bromide as the charge is different.Īlthough it doesn't seem like much, these rules can sometimes be confusing. For example, MnBr₂ is manganese(II) bromide - Mn has a charge of 2+. This is done by writing the Roman numeral in parentheses following the element name. Some cations, usually transition metals, can take on multiple charges and we want to specify which ion we are considering. Generally, these refer to the oxidation number of an atom, but it's a bit different for ionic compounds.
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