Problem: What is the chemical formula for chromium(III) oxide?

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We’re being asked to give the molecular formula of chromium (III) oxide. The rules for naming binary ionic compounds are as follows:


1. The metal keeps its name and written first.

– For transition metals, we use Roman numerals to denote its charge.


2. The nonmetal keeps its base name but has its ending change to –ide.

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What is the chemical formula for chromium(III) oxide?