Roman numerals
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Re: Roman numerals
When it is a transition metal, because the oxidation number can change. So, denoting the oxidation number through roman numerals and parentheses is necessary to denote exactly what compound you are talking about.
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Re: Roman numerals
For example, Ni (I) would represent the +1 oxidation number of nickel while Ni (II) represents the +2 oxidation number
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Re: Roman numerals
When it is common for an element to have more than one possible charge (i.e. it's common that Fe has either a charge of 2+ or 3+), Roman numerals are used. These Roman numerals help to identify the compound.
Re: Roman numerals
According to the textbook, an oxidation number is "the effective charge on an atom in a compound, calculated according to a set of rules (see Toolbox K.1). An increase in oxidation number corresponds to oxidation; a decrease corresponds to reduction."
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Re: Roman numerals
The oxidation number is the effective charge on an atom in a compound. A larger oxidation number means more oxidation while a lower oxidation number means the opposite, which is reduction.
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