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To indicate the oxidation number using Roman numerals.

e.g.

Ferric oxide or ferrous oxide /??? Which

Ferric oxide (Fe(II)O).

Ferrous oxide (Fe2(III)O3).

or

Potassium permasnganate KMnO4 The manganese is (+7) . hence

KMn(VII)O4

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lenpollock

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2mo ago
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11y ago

If the transition metal has more than one ion, you write the charge as a Roman numeral. For example copper can have an ion with a charge of 1+ and an ion with a charge of 2+. If they were combined with oxygen, they would be named copper (I) oxide and copper (II) oxide respectively.

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Q: What is the rule when writing the name of an ionic compound that contains a transition metal?
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