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The roman numeral signifies what the charge on that atom is. For example, depending on what Iron or another element is bonded to, it could be Iron II or Iron III to balance the charges. Hope this helps! #sickomode
It's important to note that some transition metals are capable of having multiple charges, hence the need for the Roman numerals in the first place. Transition metal ions involve a rearrangement of both the d and s orbitals. This is because according to the Aufbau principle, the electrons fill the 4s shell before the 3d shell, etc.
The use of Roman numerals in chemical nomenclature is to indicate the charge of the ion. Usually, the transitional metal has multiple possible ion charges. For example, Fe (II) stands for Fe2+ and Fe (III) stands for Fe3+; the charge changes according to the number of electrons on the atom.
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