00:01
This question asks us which neutral atom is iso -electronic with each of the following ions? in part a, we're asked to find what is iso -electronic with gallium -3 -plus, and this one is tricky, because this one's not going to have an iso -electronic partner, because the way this configuration is, you would be removing the electrons from the 4 -sss and the 3ds, so it's not as simple as marching back 3 on the periodic table because the 4 -s are higher energy.
00:28
There is no configuration because of that weird switch that gives us a neutral atom that's iso -electronic with gallium.
00:35
So this is none, actually.
00:38
It's a little tricky, but that's the only one here that's going to give us problems.
00:44
Zirconium 4 plus.
00:48
Zirconium is here, number 40.
00:50
If we go back 4, 1, 2, 3, 4, that puts us a krypton.
00:59
Manganese 7 plus, that's number 25 here...