2007-10-08 05:45:31 · 8 answers · asked by Smooth 1 in Science & Mathematics ➔ Chemistry
you only use roman numerals when you're dealing with an element with more than one charge, such as transition metals. like iron can be 2+ and 3+, so when you're naming a compound you have to say something like Iron (III) oxide.
the charge matches the number in roman numerals.
there's also the classical method, where you use names, like ferric and ferrous (ferric = Fe 3+, ferrous = Fe 2+)
hope this helped!
2007-10-08 05:50:42 · answer #1 · answered by a_sight_unseen22 3 · 0⤊ 0⤋
You use roman numerals when you have something that has multiple charges. Most cations with multiple possible charges are in the transition metals. Iron can be a +2 or +3 so when you name it you have to indicate which it is.
2007-10-08 12:49:35 · answer #2 · answered by smilam 5 · 0⤊ 0⤋
Some elements have more than one charge. When you are naming compounds with these elements, you use roman numerals to distinguish which charge you're using. For example, copper (II) sulfate means that you are using Cu^2+ instead of Cu^1+.
2007-10-08 12:51:11 · answer #3 · answered by Jo 4 · 0⤊ 0⤋
Oxidation numbers of course. I thought everyone would know that.
2007-10-08 12:48:50 · answer #4 · answered by Anonymous · 0⤊ 0⤋
when doing a party list
2007-10-08 12:48:47 · answer #5 · answered by musiclover 2 · 0⤊ 0⤋
Oxidation numbers (mostly of anions)
2007-10-08 12:51:14 · answer #6 · answered by cattbarf 7 · 0⤊ 1⤋
usually with transition metals
2007-10-08 13:06:32 · answer #7 · answered by purplelightning92 4 · 0⤊ 0⤋
the super Bowl :)
2007-10-08 12:48:38 · answer #8 · answered by SteelRain 3 · 0⤊ 0⤋