00:02
In this question we have ionic compounds.
00:11
Ionic compounds are composed of a cation, which is the positive ion and it's written first, and an anion, which is the negative ion, written second.
00:26
Ionic compounds, even though they're composed of ions, which are charged particles, ionic compounds themselves are neutral.
00:34
And the way that they are neutral is by the total positive charges and negative charges adding to zero.
00:45
So the total positive and negative charges add to zero in an ionic compound.
00:53
And this is going to be important to help us figure out the charge of some of these ions.
00:58
All right, so we have several compounds here and we want to identify the cation.
01:05
Again, that's the positive ion, it's written first, and the anion.
01:11
So these are going to have their respective charges with them when we identify them.
01:16
So we're writing the symbols.
01:18
Our first one is sodium chloride.
01:23
Sodium's found in the first column on the periodic tables.
01:26
When it forms an ion, it forms an ion with a single positive charge because sodium has one valence electron that it loses.
01:34
Chlorine is a halogen in group 7a.
01:38
All halogens have seven valence electrons and so to satisfy the octet rule, it wants to gain one more.
01:45
So we have sodium ion and the chloride ion, and of course, positive one and negative one add up to zero.
01:53
Then we have cu2s...