00:01
So based on kulom's law, the energy of our lattice should be, let me not put equal.
00:10
It is proportional to, so that alpha means proportional to.
00:16
The charges of the two pieces we're putting together divided by the distance between the two pieces.
00:28
And so we can also say that that's about the charges divided by the distance between our two substances can be thought about as the radius of each.
00:47
Okay, and we add them together.
00:50
Okay, so the radius of the first one plus the radius of the second one is essentially the distance between the nuclei.
00:56
And so if we're looking at something like csf versus b -a -o, a couple things i want you to look at.
01:06
Charges.
01:07
There are q's.
01:08
Q stands for charge.
01:12
So q1 and q2 are charges.
01:17
So the charge of cesium is plus one.
01:23
And the charge of the fluorine is minus one.
01:29
For our barium oxide, it's plus two and minus two.
01:41
Okay...