00:01
In this video we want to write the electron configuration, the shorthand one, for the se minus ion.
00:06
So selenium with a minus one charge, that means it's gained one electron.
00:10
So here's selenium here.
00:11
If it gains one electron we move to the right on the periodic table.
00:14
So basically it's isoelectronic with bromine.
00:16
We can just write the configuration for bromine.
00:20
Abbreviated means that the previous noble gas is going to be in brackets.
00:24
The previous noble gas, the one before it, is argon right here.
00:27
So we would write ar and then this accounts for everything up until this point.
00:33
And then we just have to write the remaining electron configuration for these electrons right here.
00:40
So the period or the row on the periodic table corresponds to the principal energy level...