00:02
Hi there, this question wants the five basic electron geometries.
00:07
So i am assuming that that means the ones where we do not violate the octet rule, that we do not have expanded octets.
00:16
All right, so i want to start off with what an electron group is.
00:24
An electron group refers to the sum of the number of bonded atoms.
00:41
So we're looking at a central atom here.
00:43
So the number of bonded atoms plus the number of lone pairs on that central atom.
01:00
That's what we call an electron group.
01:02
It's the number of groups of electrons on that central atom.
01:07
So it's going to be the sum of the number of bonded atoms plus lone pairs because a double or triple bond just counts as a single group.
01:14
That's why i always like to just count the number of bonded atoms.
01:19
Okay.
01:19
So we could have, let's go ahead and set up a little table here.
01:31
We can have two electron groups.
01:35
What that is going to give us is a central atom with just two atoms attached to it.
01:45
Or it could give us a central atom with just one atom attached and a lone pair.
01:53
In either case, these would both be considered linear.
02:04
Okay, we can have three electron groups on that.
02:07
Central atom.
02:09
We can have the situation where all three are bonded to atoms, which gives us a trigonal planar shape, or we could have a situation where one of these is a lone pair.
02:37
It's still exerting pressure as an electron group, and the other two are bonded to atoms...
