00:01
All right, so let's make sure we understand ionization energy and electron affinity.
00:06
So ionization energy, which i'll abbreviate ie, is the amount of energy required to remove the least bound or the easiest to remove electron.
00:35
So electrons are going to leave in ionization energy.
00:39
Now, when electron affinity, which i'll abbreviate ea, it's kind of like the opposite.
00:51
It's the energy absorbed or more likely released when an electron is added to an ion or an atom.
01:22
Okay, so in ionization energy, the electron is going to be a product because it's going to be leaving, and an electron affinity, it's going to be a reactant.
01:35
It's going to wind up coming into our reaction.
01:37
So let's write some values for this.
01:41
Now, in all of these cases, if i say something like the first ionization energy, we know that ionization energy is removing an electron, so that that, means removing the first electron.
02:03
If i said second ionization energy, that's removing the second electron and so on.
02:12
So for instance, in the first ionization of whatever atom, we'll just call it a, the electron will be removed and will have a positive ion.
02:26
If i remove the second one, if i remove the second one.
02:29
That must mean that the first one is already removed.
02:33
So that first one is gone.
02:35
So we still have a positive charge.
02:37
We release the second one and now the charge is two.
02:43
So i'm telling you this because in our first example, we're going to try to remove the fourth electron because we're looking at the fourth ionization energy of selenium, s .e...