00:02
Hi there.
00:03
In this question, we are working with a co2 molecule, and we want to know its molecular geometry and its bond angle.
00:12
So to do this, we need to draw its lewis structure first, because then we can apply vesper theory to determine its shape, and from that get the bond angle.
00:23
So to draw its dot structure, we need to know how many valence electrons we are working with.
00:27
Carbon is in group four of the periodic table, so it has four valence electrons.
00:32
And then there are two oxygen, and each oxygen is a member of group six, so each oxygen has six valence electrons.
00:42
So this gives us a total of 16 electrons to place in our lewis structure.
00:47
We know that a single atom goes in the center, unless we are told otherwise, so we'll put the carbon in the center.
00:54
And we also know that there needs to be at least one pair of electrons between each carbon and oxygen to form a bond.
01:04
So that uses four of our electrons.
01:06
We have 12 more electrons remaining, and we know that each of these elements needs to end up with eight dots around it, or an octet.
01:17
All right, so let's start adding some dots here.
01:28
All right, we'll complete oxygen octets first.
01:32
Okay.
01:33
Oops, i have just run out of...
01:35
Electrons.
01:36
I have used all 16 dots and while the oxygens are good with eight dots around them, the carbon only has four.
01:44
So this suggests that i need to make some multiple bonds.
01:48
So i'm going to take a pair of electrons off of the left oxygen and move them in between.
01:55
This gives us a double bond there and now carbon has six electrons around it.
02:00
Well if i do that again, but to the right side, now, carbon has eight dots.
02:11
Each oxygen has eight dots or valence electrons...