"Welcome. And congratulations. I am delighted that you could make it. Getting here wasn’t easy, I know. In fact, I suspect it was a little tougher than you realize.

To begin with, for you to be here now trillions of drifting atoms had somehow to assemble in an intricate and curiously obliging manner to create you. It’s an arrangement so specialized and particular that it has never been tried before and will only exist this once. For the next many years (we hope) these tiny particles will uncomplainingly engage in all the billions of deft, co-operative efforts necessary to keep you intact and let you experience the supremely agreeable but generally under appreciated state known as existence."  

(Introduction to Bill Bryson's A Short History of Nearly Everything)

Rainbow Fire... We will demo flame tests of various elements in class to understand the energy levels of electrons

Useful Resources for the Applied Atomic Theory Timeline:

Atomic Theories

Atomic Models

Timeline

Atom Timeline

Scientist Bios

Atomic History

Early Atomic Theory: Dalton, Thomson, Rutherford, and Millikan tutorial

The Greek Concept of Atomos 

Democritus 

Dalton

Dalton

Dalton

JJ Thomson

Discovery of the Electron

JJ Thomson - Electrons

Cathode Ray Tube Experiment

Electrons

Discovery of the Electron Intro

Millikan

Millikan Oil Drop Experiment

Millikan Tutorial

Oil Drop Experiment

Oil Drop Experiment

Nucleus 

Chadwick 

Neutron 

Rutherford

Rutherford 

Rutherford Experiment

Rutherford Model

Bohr

Dr. Sheldon Cooper writing electron configurations: 

 

Click to Run

 

Click to Run

 

Click to Run

PhET: Build an Atom

You may think you are sitting on your chair, but in reality, you are hovering 10^-8 cm above your chair (floating!) because of electron repulsion!

Practice Electron Configurations

Practice Counting Protons, Neutrons, and Electrons

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