00:01
All right, so we have a multiple choice question, and we want to pick the one that has the pair of species that are isoelectronic, where isoelectronic means that they have the same number of electrons.
00:13
I have the periodic table here for reference to help us count.
00:18
So for part a, carbon monoxide and nitrogen monoxide.
00:24
Now, these are molecular species.
00:27
They're all made of nonmetals.
00:28
So there's no ions, no electrons have been lost or gained by anything.
00:32
So the number of electrons is the same as a neutral atom, which is the same as the atomic number.
00:36
So for carbon, that's going to be 6, and for oxygen, that's 8.
00:41
So 6 plus 8 is going to be 14 electrons in this species.
00:45
And then for nitrogen oxide, it's 7 plus 8, which is equal to 15.
00:50
So that's not going to be our answer.
00:52
Then for part b, we have carbon dioxide, co2, and azide, which is the nitrogen n3 with a minus 1 overall charge.
01:11
So carbon has 6.
01:12
There's 2 oxygens, which each have 8 electrons.
01:16
That's 6 plus 16 is equal to 22...