1. Electron Configuration HW #1 out, please
Warm-up (Nov 16 and 17)
Electron Configuration HW #1 out, please
2B – also Lab 7 Questions out!
Give the full ground state electron configurations for:
Arsenic
Gold +3
What is this element?
1s2 2s2 2p6 3s2 3p6

2. Homework 1 Questions?

3. Lab 7 Debrief - 2B

4. Orbitals
We can’t know where an electron IS at any given point, but we have a vague idea…
Probability maps give us specific shapes:

5. Our new(est) atomic model

6. New (and last) Atomic Model!
For now…. (mwahaha!!!!!)

7. Okay, but which electrons are in which orbitals?? RULES TIME:
Pauli Exclusion Principle: No electrons can be exactly in the same place in an atom
What about 1s2? Aren’t they the same?
Electron up = SPIN UP
Electron down = SPIN DOWN

8. Okay, but which electrons are in which orbitals?? RULES TIME:
Hund’s Rule: Electrons like to be without an electron pair in their orbitals as much as possible! (Lower Energy)
Phosphorus

9. Which is more likely for Sulfur?
Unpaired electrons

10. How do we know? What evidence is there?
This gives us evidence that full orbitals and half-full orbitals are HAPPY!

11. Orbital Diagrams
Draw one for Boron
Then, try Arsenic

12. Why do we care? So, Li is just 2s1 ACTIVITY TIME!
On a post-it note, write the last term and element symbol for the element number on your desk!
So, Li is just 2s1

13. It’s SO AWESOME!
You don’t need your electron roadmap anymore! Just use the Periodic Table!

14. (whining) “Ms Klug, isn’t there an easier way?”
YEP! Noble Gas Configuration
Which noble gas is closest to calcium?
Shorthand: [Ar] 4s2
Arsenic: [Ar] 4s2 3d10 4p3

15. Let’s try some Noble Gas Configurations:
Aluminum
Scandium
Oxygen
Tin

16. Bohr to our (Current) Reality…
Great video sum-up of Bohr and beyond
Video:
5:20 min to end

17. Astronomers use Spectroscopy Too!
Video:
We can know the amount of elements in the stars and we can also know the age of the star from spectroscopy!

18. Electromagnetic Radiation Spectrum
It’s all probability – the lines we see have to do with the most probable (and common) electron.

19. 1B Quiz Corrections
If done, work on WS #2

20. Homework Day 9 Electron Configuration WS #2 Read pages 133-135
Lab 8 Next time – bring safety gear and lab books!
Quiz coming up after Thanksgiving on Unit 2 so far!