Other+Scientists

Democritus
[] Summarize his theory of the atom. Democritus theory was that evrything was made up of invisiable particales called atoms. And that the only things diffrent between this atoms where shape, position, arrangment. His theory also believed that atoms cannot be destroy and divided any further.

Who were his critics and what theories were postulated to challenge his?

James Chadwick [] What did he discover and when? Why did it take so long to make this discovery?

Louis DeBroglie [] Explain his contribution to the wave-particle duality theory.

|| || idea of the electron having wave properties and it seemed to him that the electron might be like a **standing wave** around the nucleus. A standing wave is like a string stretched between 2 points and plucked, like a guitar string.
 * [[image:http://www.kentchemistry.com/images/links/atomic/0fc85aba-0d33-4e6a-8e85-65d92f345d90.gif width="386" height="162"]] ||

Robert Millikan [] What is Millikan’s major contribution? He was able to measure the elementry electric charge

Watch the video that animates the Oil Drop Experiment. Let’s pretend that you have to explain what happened in this experiment to a class of fourth graders. How did the experiment work and what did Millikan find out? You cannot use any big fancy words!!!

In his exipriment a mist of oil was sprayed into a chamber with an atomizer, some of the oil dropplets fell to the bottom floor, he was able to find the mass of the atom due to acceleration of gravity. He then used X rays to make the oil droplets negativly charged. After that he was able to slow down the droplets fall so much that he was able to suspend them with the right amount of energy.



Erwin Schrodinger and Werner Heisenberg [] State Heisenberg’s Uncertainty Principle. Explain Schrodinger’s contribution to the model of the atom. Find visuals that show what Schrodinger’s s, p, d, and f energy sublevels look like.