1. Electron Configuration and Orbital Diagrams
More fun stuff!

2. Electron Configurations!!
Back to this from the other day: FIND IT!!
It tells you what the electron configuration ends with…

3. Lovely. What Can I Do With It?
We can write electron configurations!
How do we do that?
We find the number of electrons.
We place them into orbitals, filling lower energy to higher energy.
Is there a chart to use?
Indeed there is!!

4. Electron Configuration Chart

5. Great! How Do I Use It? Follow the arrows!
How many electrons fit in s? p? d? f?
So you start at the top of the chart and fill in until you run out of electrons!
To note: the d orbital does not like to be almost full or almost half full! Sometimes it steals electrons from the previous s orbital! 2 6 10 14

6. Yeah, We’re Gonna Have to Practice That…
Let’s do Aluminum!
Aluminum’s atomic # = 13
=13 protons: (no charge) = 13 electrons
So starting from the top of my chart:
Al: 1s2 2s2 2p6 3s2 3p1
Letters = shape and max # of electrons
Exponents = # of electrons in each orbital
= = = = =13 = 13 electrons
Big #s in front = size of orbital

7. You Do a Few!
Write the electron configurations for the following atoms:
Lithium
Argon
Magnesium

8. Check It! Lithium: Li: has 3 electrons Li: 1s2 2s1
Argon: Ar: has 18 electrons
Ar: 1s2 2s2 2p6 3s2 3p6
Magnesium: Mg: has 12 electrons
Mg: 1s2 2s2 2p6 3s2
( = 3 total)
( =18 total)
( =12 total)

9. Can we do some with our partners?
Yep.
Do problems 1-5.

10. Noble Gas Electron Configuration
It’s like a shortcut….kind of….
Find the previous Noble Gas (Group 18).
Write brackets around it.
After the brackets, write the rest of the electron configuration that isn’t included in the noble gas.

11. Let’s See One! Let’s do magnesium, Mg.
The Noble Gas before it is Neon.
So we write [Ne].
Then follow the periodic table from yesterday until you get to Magnesium, so…
Mg is in the 3s row, and I have to hop over 2 spaces to get there.
So we add 3s2 after the noble gas, so we get:
[Ne] 3s2

12. I know it’s not on your notes, but…
Let’s do Nitrogen, N.
Previous Noble Gas?
What do you have to go through to get from He to N?
2s2 AND 2p3
So we end up with [He] 2s2 2p3
Helium

13. Can we do this one with our partners?
Yep.
Do problems 6-10.

14. More fun with Electrons!
Orbital Diagrams: show the different electrons in each sublevel of each orbital:
Uses the same concept of electron configuration, except this one has fun boxes showing sublevels!
2 electrons per sublevel=2 electrons per box.

15. Yeah, I’m Gonna Need to See That…
For instance, let’s do Oxygen:
Oxygen (atomic # 8) has 8 electrons:
What would be electron configuration notation?
O: 1s2 2s2 2p4
So orbital diagram would look like this:
Note: You want an arrow going up in each box before you put arrows pointing down!

16. You Do One
What would be the orbital diagram for Bromine??

17. Check It!
Bromine, Br (atomic# = 35) no charge, so there are 35 electrons.
Electron configuration would be:
Br: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
And now we will draw it on the board!
( = 35 total)

18. Let Me Guess: We’re doing these with our partners, too?
You got it!
Do problems and check all the answers before turning it in.
Wait for everybody to get done before we start lab.