2006-12-14 04:20:37 · 3 answers · asked by Plasma 1 in Science & Mathematics ➔ Chemistry
The Roman numeral designation indicates the oxidation state of that element in the compound. In a compound best represented as ionic in nature, this is is equal to the charge on the ion in question. That is, lead (II) in a written name means a [Pb]2+ ion. Lead (IV) would mean [Pb]4+.
Please try not to use words like "valency" or "valent". It's terminology over a century old, that used to apply to what people thought was a single idea and is now used in reference to three or four different things, which are often mutually contradictory. If you mean oxidation state, say that. If you mean number of bonds, say that. If you mean number of electrons available for bonding, say that. Don't say "valence", it's confusing.
2006-12-14 04:41:29 · answer #1 · answered by Stephen McNeil 4 · 1⤊ 0⤋
Lead has two valencies, 2 & 4. (II) means the bivalent lead. This is plumbous nitrate, the more common variety. The other one is Plumbic.
2006-12-14 04:34:49 · answer #2 · answered by saudipta c 5 · 0⤊ 1⤋
The (II) stands for the valancey of the lead.
2006-12-14 04:25:36 · answer #3 · answered by yt 1 · 0⤊ 1⤋