422-002+J.+Mihanni+Big+Time+Line+Project

=Timeline - History of the Atom=

The Greeks began the journey of scientific discovery into what this world is made of. They did things a little different than modern scientists do today. They didn't conduct experiments but rather their theories were based on speculation and logical reasoning. They only used experimentation to reinforce existing ideas.
 * __//Ancient Greece://__**

> Took Aristotle's thought's a step further and associated the Elements with **FOUR GODS**:
 * **Empedocles (//490 - 430 BC Sicily) [[image:empedocles-2-sized.jpg width="140" height="149" align="left" caption="empedocles-2-sized.jpg"]]//**
 * Hera (Earth)
 * Persephon (Water)
 * Zeus (Air)
 * Hades (Fire)

Was a Greek scholar who is best known for his atomic theory although he was also an excellent geometer.
 * **Democritus (460-370 BC Greece)**[[image:http://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Demokrit.jpeg/200px-Demokrit.jpeg width="120" height="149" align="left" link="http://en.wikipedia.org/wiki/Image:Demokrit.jpeg"]]

Emphasized that nature consisted of **FOUR ELEMENTS**: He thought these were fundamental properties. For example, dryness and heat was associated with fire, heat and moisture with air, moisture and cold with water, and cold and dryness with earth.
 * **Aristotle (384-322 BCE Greece)[[image:http://faculty.washington.edu/smcohen/433/Aristotle.jpg width="119" height="156" align="left"]]**
 * Air
 * Earth
 * Fire
 * Water

//395- 387 BC Corinthian War 334 BC Battle of Issus 300 BC Euclid Publishes Element//


 * //__17th through 19th Centuries:__//**

//1801 America's War with Tripoli 1822 Ashanti War Begun 1844 Franco Moroccan War// Was an English chemist, meteorologist, and physicist. In 1803 he proposed definitions for the terms: Matter, element and compound. 1) All matter is made of atoms. Atoms are indivisible and indestructible. 2) All atoms of a given element are identical in mass and properties. 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms.
 * **//John Dalton (1766-1844 England)//**
 * //Dalton's Atomic Theory (1808)://


 * J.J Thompson (1856-1940 England)**