Systematic Names

Edexcel AS-level ChemistryOxidation and ReductionLesson 5 of 14

The names of compounds include the oxidation state of the element that can have variable oxidation states in Roman numerals.

For example, in iron(II) sulfate and iron(III) chloride, the iron has oxidation states of +2 and +3 respectively.

This tells you that they contain Fe²⁺ and Fe³⁺ ions.

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oxidation number: A number assigned to an atom showing its degree of oxidation, based on the electrons it would gain or lose if all bonds were ionic.