-
101
Thales 624-546 B.C.
though all things were made of water -
101
Democritus 460 B.C.
Thought all matter was made up of atoms -
101
Aristotle 384-322 B.C.
Thought everything was made of water, fire, earth, and air -
Issac Newton
Thought matter was formed of solid, massy impenterable particles -
John Dalton
The Atomic Theory:
1. all matter is made of atoms
2. atoms are indivisible and indestructible
3. all atoms of a given element are identical in mass and properties
4. compounds are formed by a combination oof two or more different kinds of atoms
5. a chemical reaction is a rearrangement of atoms was the first to have expiermental evidence model -
Henri Becquerel
discoverd radioactivity -
Joseph John Tomson
was widley recognized for his discovery of the electrom -
Ernest Ruthford
discovered the nucleus -
Millikan 1909-1912
found the charge of an electrom -
Niels Bohr 1911-1916
- created the Bohr model of the atom
- thought that electroms orbit around the nucleus
-
Erwin Schrodinger
- the quantum mechanical
- predicted the odds of a electrom location
- proved Bohre model wrong
-
James Chadwick
proved existence of neutrons