Dalton's Atomic Theory

The first thing we learned in this unit is Dalton's Atomic Theory. He was the first scientist to look into atoms, and he did not know anything of the structure (electrons, protons, nucleus, etc). Although this is true, he constructed 5 theories about atoms that mostly still hold true today--besides one.

1. all elements are composed of atoms
2. atoms of a given element are identical (this is the one that was later found to be false)
3. atoms of different elements are different
4. compounds contain atoms of different elements
5. atoms are indivisible and aren't created or destroyed in chemical reactions (partially true)

A website that elaborates on Dalton's theory is http://dl.clackamas.edu/ch104-04/dalton's.htm.