00:01
Hi there.
00:02
In this question, we have vanadium with three chlorides in a compound.
00:10
And what we need to do is determine that charge or that oxidation number of the vanadium, because we need to include that in the name as a roman numeral.
00:20
To do that, we have to work backwards just a little bit.
00:23
Chlorine is a halogen, so it's in group 7a of the periodic table.
00:27
So when each chlorine atom forms a chloride ion, each one gains one electron.
00:32
So in other words, chloride.
00:34
Has a charge of negative 1.
00:37
But we have three of those chlorides.
00:40
So our total charge of the chloride is 3 negative.
00:48
Well, in an ionic compound, the compounds are neutral.
00:53
So that means the positive charge has to add to the negative charge and give us 0.
00:59
If the charge of the 3 chloride ions is 3 negative total, then the charge of the vanadium must be 3 positive.
01:07
So we have a vanadium.
01:09
Ion here that has an oxidation number of positive three, or in other words, a three positive charge...