QA › Chemistry › When do we have to use roman numerals in the name of a compound?
Q

When do we have to use roman numerals in the name of a compound?

A

As a rule, we use roman numerals in the name of a compound when a metal cation forms two ions with different states of oxidation.

For instance, Cu can form two different ions – Cu+ and Cu 2+. Combining with chlorine, it will form CuCl and CuCl2 respectively.

So, the first compound, formed from copper 1+ ions will be called copper(I) chloride.

The second compound, formed from copper 2+ ions will be called copper(II) chloride.

 

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