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### Roman Numeral

Posted: Sun Dec 01, 2019 11:27 am
I see roman numerals in a lot of the coordination compounds, and I don't know what it represents. So my question is what do the roman numerals represent or mean?

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 11:29 am
It represents the positive charge on a cation. For example a copper (ii) sulfate CuSO4, represents a Cu^2+ ion which attaches itself to the sulfate anion (SO4^2-)

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 2:55 pm
If we use the roman numeral for positive cations what do we use if the transition metal has a negative anion charge? will this happen?

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 2:57 pm
it represents the charge of the element you are dealing with.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 3:22 pm
I have personally not seen an instance where the transition metal has a negative anion charge if the charge is designated by a parentheses. If I see a roman numeral, I assume it's "plus whatever that charge is" and it works for me.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 3:23 pm
As many have said above, it represents the (usually positive) charge of the atom it's coupled with. Usually only transition metals have this notation.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 7:17 pm
How do you calculate the oxidation number of the metal in a complex?

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 7:22 pm
Debora Fernandez Clemente_ 4H wrote:How do you calculate the oxidation number of the metal in a complex?

To calculate the oxidation number of the metal in a complex, you would use the equation:

(# metal atoms)(oxidation number of the metal)+$\sum$(# each ligand)(charge of each ligand)= charge of ion

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 9:06 pm
The roman numeral tells you the charge of the metal ion.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 9:35 pm
The roman numeral is the charge of the metal in the compound.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 11:33 pm
The roman numeral represents the oxidation state of the metal.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 11:42 pm
It tells you the oxidation state.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 11:43 pm
The roman numeral is the charge of the metal in the compound.

### Re: Roman Numeral

Posted: Sun Dec 01, 2019 11:47 pm
The roman numerals represent the oxidation number of the metal ion.