00:01
All right.
00:02
So here what we're asked to do is kind of work a problem of electron configuration, but take into account ions that can either lose or gain electrons.
00:13
So what we've been given is to state the electron configuration for calcium 2 plus and also titanium 2 plus.
00:21
Now just as a reminder that 2 plus means that you have lost two electrons.
00:28
If you have less negative things, then you're going to have an overall positive charge.
00:33
So i'll kind of pencil that in here.
00:35
So this means we have lost two electrons.
00:39
All right.
00:40
Now, what we're going to do is we're first going to kind of write the normal electron configuration for each atom, and then we'll decide what to do with losing those two electrons.
00:52
And to save us a little bit of time, we're going to use the noble gas abbreviation, calcium and titanium are both on row four.
00:59
So for the noble gas abbreviation, we go back to row three and find the noble gas, argon at the end of that row.
01:07
We'll take argon and put it in brackets to kind of stand in for the place of everything up to that point.
01:15
Then we can pick up with our normal electron configuration.
01:18
So calcium is in the s block, the second element in.
01:22
So it's normal configuration will be 4s2.
01:26
Then titanium is in the d block, and remember the number for that energy level changes.
01:35
So for titanium, it will be 4s2, then 3d2...