00:01
To draw the lewis structure, we first need to count the total number of valence electrons.
00:08
For nitrogen, each nitrogen has five valence electrons, and there are two of them, so that gives us a total of ten valence electrons.
00:19
If we bond the nitrogens to each other, we would have used up two of the ten.
00:24
Each bond is two electrons, so we have eight remaining.
00:29
If we start to give the nitrogens a lone pair so that they have, or lone pairs, so they have an octet, we're going to run out after we've added four pairs.
00:41
This nitrogen has an octet, this one doesn't, so that means the nitrogen needs to share a couple of its lone pairs to form a triple bond, and this would be its lewis structure.
01:01
For the next one, we have ch2cl2.
01:08
Carbon has four valence electrons, hydrogen has one, there are two of them, chlorine has seven, there are two of them, so this gives us 20 total valence electrons.
01:25
If we put carbon in the middle, we bond our hydrogens and our chlorines.
01:31
Each bond is two electrons.
01:34
We've got four of them, so we would have used up eight of the twenty.
01:37
We now have twelve remaining...