-
101
Thales 620BCE
First person to investigate basic principles. -
102
Democritus 440BCE
1st atomic theory, cutting the cheese until couldnt anymore -
103
Aristotle 340BCE
the four elements: fire, earth, water, air -
104
Sir Issac Newton 1704
Matter is formed of solid, massy particles -
105
John Dalton 1803
- All matter is made up of timy particles called atoms
- All atoms of a given element are alike, but are different from the atoms of any other element.
- Compunds are formed when atoms of different elements
- A chemical reaction involves a rearrangement of atoms, not a change in the atoms themselves
-
106
Henri Becquerel 1896
Radioactivity, figured out things could be radioactive -
107
JJ Thompson 1897
discovered electrons and plum pudding model -
110
Neils Bohr 1913
Had the primitive hydrogen model
Had the theory on electrons -
111
Francis Aston 1919
Founder of the isotope -
112
Erwin Schrodinger 1926
Found the probability an electron would be in a certain position (where they would be located)
The Quantum Mechanical Model of the Atom -
Millikan 1908
Oil Drip Machine -
Ernest Rutherford 1911 & 1919
a beam of alpha particle shot at a sheet of gold
created with nucleas and proton