Checklist Trend is stated Shielding Nuclear charge Highest

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

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

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

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?

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

Mass Spec: The instrument- Ions with greatest mass and smallest charge are deflected the least!

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

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

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

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.

Complete practice problems 1 - 5

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.

POGIL version

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

Stopwatch Stop after question 12!

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

Stopwatch Stop after question 14 c!