Roman Numeral

[Frederick Keith_4C]

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?

[DarrenKim_1H]

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-)

[serenabirkhoff_1K]

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?

[Max Madrzyk Dis 4G]

it represents the charge of the element you are dealing with.

[405268063]

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.

[Brian J Cheng 1I]

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.

[Debora Fernandez Clemente_ 4H]

How do you calculate the oxidation number of the metal in a complex?

[Cynthia Rodas 4H]

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)+(# each ligand)(charge of each ligand)= charge of ion

[cassidysong 1K]

The roman numeral tells you the charge of the metal ion.

[mayarivers3I]

The roman numeral is the charge of the metal in the compound.

[Marykate Abad 3L]

The roman numeral represents the oxidation state of the metal.

[emaad_3H]

It tells you the oxidation state.

[Abraham De Luna]

The roman numeral is the charge of the metal in the compound.

[Presley Gao 2C]

The roman numerals represent the oxidation number of the metal ion.