The following is a summary of our work from class last week.
This study guide is a great tool that you will need for the essay portion of your UNIT TEST! However, please be advised that this timeline is NOT INCLUSIVE of all of the information or theorists that you need to know.
This is simply a review based on responses given in class. There are a few KEY PEOPLE missing from this timeline that you are responsible for studying!
Your blog posting assignment this week is to find the missing theorists, summarize their work, and list where on the timeline they belong.
P.A.T. (Preferred Activity Time) Points will be awarded to the first student who posts the correct answer.
Democritus
- 400 B.C.E.
- Believed that atoms were tiny indivisible particles.
John Dalton
- 1808
- All matter is composed of extremely small particles called atoms.
- Atoms of a given element are the same in size, mass and other properties; atoms of different elements differ in size, mass and other properties.
- Atoms cannot be subdivided, created nor destroyed.
- Atoms of different elements combine in simple whole-numbers rations to form chemical compounds.
- In chemical reactions, atoms are combined, separated, or rearranged.
J.J. Thomson
- 1897
- Cathode-ray tube experiments
- Discovered electrons
Ernest Rutherford
- 1911
- Gold-foil experiments with alpha particles
- Discovered positive core center of an atom
Neil Bohr
- 1913
- Electrons can circle the nucleus only in allowed paths, or orbits
Quantum Model
- 1924
- Electrons exhibit wave-like patterns, and the location of them can be mathematically determined.
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