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Chromium III is Cr3+. The roman numeral tells you the charge.

Sulfide is S2-. You can figure this out from the Periodic Table. Sulfur needs two electrons to be like Argon, the next noble gas.

When they form a compound, they combine in a ratio such that the total positive charge balances the total negative charge.

2 Cr3+ ions have a total charge of +6.

3 S2- ions have a total charge of -6.

So the formula is Cr2S3.

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