00:01
Okay, so i want to write the lowest formula for the following.
00:03
And a lowest formula just shows electrons involved in bonding.
00:06
So the first one is methane, ch4.
00:08
This is the symbolist of the achines.
00:12
And carbon can form four bonds.
00:14
So it's going to be the central atom.
00:15
Hydrogen can form one bond.
00:21
And there are two electrons that are bond, and they're oriented like this.
00:27
And it's going to have this tetrahedral shape.
00:35
F or b.
00:36
We have fluoromethine.
00:39
And the formula is ch3f.
00:42
So we're just going to replace one of the hydrogens with a fluorine.
00:47
So taking our original structure and just dropping one of the hydrogens.
00:59
And the halogens have seven valence electrons...