1. Checklist:
___ Trend is stated
___ Shielding
___ Nuclear charge
___ Highest filled orbital
___ Coulomb’s Law (optional)

5. Evidence of Atomic Theory:
We have seen several pieces of evidence supporting ideas about electron arrangement.
1. Light being emitted by excited atoms

6. Evidence of Atomic Theory:
We have seen several pieces of evidence supporting ideas about electron arrangement.
1. Light being emitted by excited atoms
2. PES – Photoelectron Spectroscopy

7. Evidence of Atomic Theory:
We have seen several pieces of evidence supporting ideas about electron arrangement.
1. Light being emitted by excited atoms
2. PES – Photoelectron Spectroscopy
IS THERE ANY EVIDENCE SUPPORTING WHAT WE THINK NUCLEI LOOK LIKE?

8. Mass Spectrometry: The theory-
Shot put
The theory-
With the hair dryer off – balls roll straight down
With the hair dryer on – they are deflected according to …

9. Mass Spec: The instrument-
1.   A small sample is ionized, usually to cations by loss of an electron.   The Ion Source 2.   The ions are sorted and separated according to their mass and charge.   The Mass Analyzer 3.   The separated ions are then measured, and the results displayed on a chart.   The Detector
Ions with greatest mass and smallest charge are deflected the least!

10. Most of the time the charge is +1, so this is just the mass
The Data:
A sample of Boron is analyzed
Percent abundance
Mass/charge ratio
Most of the time the charge is +1, so this is just the mass

11. The Data: A sample of Boron is analyzed 10 11 Percent abundance
Mass/charge ratio

12. The Data: A sample of Bromine is analyzed
Bromine has 2 common isotopes, why so many peaks?

13. Mass Spec analysis of a sample of rock
The major components of the rock are known to be iron, silicon and aluminum. Which peaks represent the presence of these atoms.

14. Complete practice problems 1 - 5

15. The two common isotopes of Chlorine have masses of 35 and 37
The two common isotopes of Chlorine have masses of 35 and 37. Explain the existence of these three peaks in the mass spectra of Chlorine.

19. POGIL version

20. Stopwatch
Stop after question 6!
If you are done well before other groups, raise your hand and show your teacher.

22. Stopwatch
Stop after question 12!

23. Each group draw what you think the mass spectrum for Pb would look like on the board

26. Stopwatch
Stop after question 14c!