00:01
We have to choose ions, which is electronic with argon.
00:05
So let's start with a configuration of argon.
00:08
Argon has a configuration of 1s2, 2s2p6, 3s2, 3p6.
00:27
So now let's look at calcium 2 plus.
00:31
So first let's look at calcium 0.
00:33
It has a configuration of 1s2, 2p6, 3s2, 3p6, 4s2.
00:49
So if two electrons are removed forming calcium 2 plus it has a configuration of 1s2, 2s2, 2s2, 2p6, 3s2, 3p6, 4s0.
01:04
So this is the same as argon.
01:10
So therefore, calcium 2 plus is is electronic with argon.
01:15
So the next one is sulfur 2 plus.
01:18
So first we'll start with sulfur 0.
01:20
Sulfur 0 has a configuration of 1s2, 2s2, 2s2, 2p6, 3s2, 3p4...