1. 9/11/2015
spdf Shortcut!
Write the spdf electron configuration for Gold (Au).
Write the spdf electron configuration for Iodine (I).
Write the spdf electron configuration for Uranium (U).
Write the spdf electron configuration for Tin (Sn).

2. Grades Are you happy with your grade in Chemistry?
Do you believe that there is anything that you can do to earn a better grade by the end of the semester?
What can you do to improve your experience?

3. Changes this Quarter Below a 70% on Tests & Quizzes
Test & Quiz retakes
End of semester projects
ASP Availability
Seating Charts

4. Quote of the day...
Its not about perfect. Its about effort. And when you bring that effort every single day, thats where transformation happens. That's how change occurs.

5. Electron Configuration
Review
Neils Bohr - Electrons (e-) are in specific orbitals
Protons = Electrons
2 electrons in orbit 1, 8 e- in orbit 2, 18 e- in orbit 3

6. Electron Configuration
Electrons have little mass
They exhibit particle & wave properties
We can determine the position of an e- from the nucleus through 4 Quantum Numbers:
1. Principle Number (Energy of e-)
2. Angular Momentum Number (Shape of Orbital)
3. Magnetic Number (Orientation/Position of Orbital)
4. Spin Number (Spin on e- ; +/-)

7. Principle Quantum Number (n)
Distance from Nucleus
Electrons far away have higher values for n
Electrons that are closer are more attracted to the nucleus and are more stable
As n increases, so does energy & the likelihood that the electron will be lost

8. Angular Momentum (l)
Angular Momentum Describes the shape of the orbital
Can be shown by letters & numbers
s, p, d, f and up the alphabet

9. Angular Momentum (l) s orbital spherical in shape
p orbital is dumbell in shape

10. Angular Momentum (l) Another view Max of 2e- in s subshell
Max of 6e- in p subshell
Max of 10e- in d subshell
Max of 14e- in f subshell

11. Magnetic Number
Shows the orientation in space
s orbital
p orbital

12. Notation
Physicist & Chemists use a standard notation to show the electron configurations of atoms:
Hydrogen 1s1 (1 e- in s orbital of the 1st shell)
Li 1s2 2s1 (2 e- in 1s subshell & 1 e- in the 2s subshell)
P 1s2 2s2 2p6 3s2 3p3
Can you find the # of e- in Phosphorus?

13. Notation
In larger atoms, Noble Gasses are used to help abbreviate the notation
Ex: We can change P from 1s2 2s2 2p6 3s2 3p3 to [Ne] 3s2 3p3
We can do this because Neon is 1s2 2s2 2p6
Find the closest Noble Gas & build from there

14. Aufbau Principle The order for filling atomic orbitals
Aufbau (German: to build up or construct)
Note the pattern for s, p, d, & f

15. s, p, d, f & the Periodic table
The format of the periodic table relates to electron configuration

16. Any Questions?