00:02
In this question we need to name these two ionic compounds.
00:07
So the first step when we are naming these is we name, since they are ionic compounds they are composed of a cation and an anion, in other words a positive ion and a negative ion.
00:20
So we name the cation and the anion in order.
00:27
So that would be our first step.
00:30
So in other words for our first one here we see that pb is lead and cl is chlorine.
00:39
For our second step we change the suffix on the anion, that second one, the negative one, we change the suffix to ide.
01:14
So our chlorine we would not say lead and chlorine we would say lead chloride because we change that ine to an ide.
01:26
And finally if the cation, which is a metal, the cation is going to be a metal in these unless it is a polyatomic ion.
01:41
If it has more than one oxidation state, in other words it can form ions with different charges, we need to use a roman numeral to tell the reader the charge.
02:07
So that requires us to work backwards just a little bit because we need to figure out the charge of lead because lead does not have just one oxidation state.
02:19
We know that things in group 1a and 2a have one oxidation state as does aluminum in group 3a but lead we see on the periodic tables in group 4a.
02:33
So we don't have a rule, we don't have anything that tells us it always has the same charge because it does not.
02:39
So we need to figure out what its charge is here.
02:42
Well we know the chlorine or the chloride ion has a single negative charge because all of the halogens form ions with a single negative charge and there are four of those.
02:53
So our total negative charge is negative four...