Sci: Atomic Theory Flashcards
1
Q
called it Atomos
A
Democritus
2
Q
Categorized everything to 4 elements
A
Aristotle
3
Q
Solid sphere model
all matter is made up of tiny spheres that bounce with elasticity
A
John Dalton (1808)
4
Q
Plum pudding or raisin Bread theory
atoms can eject a negative particle called electron
A
Joseph John Thompson (1898)
5
Q
EMPTY SPACE MODEL
positive charge was all in a central nucleus
A
Ernest Rutherford (1910)
6
Q
ORBIT MODEL / PLANETARY MODEL
electrons were in orbits
A
Niels Bohr (1913)
7
Q
He proved electrons were negatively charged by performing an experiment where he measured effect of electric field on oil droplets
A
Robert Millikan (1908)
8
Q
Electron Cloud Model
A
Erwin Schrödinger and Werner Heisenberg (1920)
9
Q
the existence of the neutron
A
James Chadwick (1932)
