ATOMIC STRUCTURE TIMELINE AND SUBATOMIC PARTICLES.

Greek philosopher that said all matter is made of tiny particles called "atomos" or atoms.

Democritus

believed that earth, water, fire, and air make up matter. did not believe in atoms.

Aristole

atomic theory has 4 parts:

- atom is indivisible

- Atoms of the same elements are identical & atoms of

different elements are different.

- Atoms of one element can never be

changed into atoms of another element.

- Atoms of different elements can physically mix together or chemically combine w/one another to form simple whole-number ratios to form compounds.

Dalton

discovered the proton

Goldstien

discovered the electron

(corpuscle)

Thomson

Believes that atom has a central core but there was no experiment to prove it.

Nagoaka

Oil drop experiment that determined the mass of the electron

Millikan

Gold foil experiment, discovered that atom has a central core called nucleus

Rutherford

Planetary model - movement of things in the atom

Bohr

detects how much radiation something is giving off.

Geiger

wave/ quatum mechanical model: probable location of an electron

Schrodinger

quantum mechanics: wave motion of an electron

de Brogile

Discovered the neutron

Chadwik

found 3 quarks that make up a proton

Gell-mann and Zwig