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So you know the charge of the cation. For example, because Iron isn't in group 1 (charge 1+) or group 2 (charge 2+), its charge is undetermined until you give it one with roman numerals.

Iron (I) Carbonate - Fe2CO3

Iron (II) Carbonate - FeCO3

Iron (III) Carbonate - Fe2(CO3)3

Iron (IV) Carbonate - Fe(CO3)2

Although the above compounds are made using the same elements, the roman numerals make them different.

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11y ago
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13y ago

The roman numeral indicates the oxidation state of the element. They are most commonly found with transition metal complexes. For example if we have a complex such as [Zn(II)Cl2] the overall charge is neutral whilst the charge on the metal in this case Zn is +2.

Note- each chlorine atom is negatively charged

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16y ago

It has to do with the charge.

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Q: Why are roman numerals needed to name a compound?
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