HISTORY OF THE ATOMIC STRUCTURE

Aristotle & Plato

all substances were made of Fire, Water, Air, and Earth.

John Dalton

the development of modern atomic theory.

Eugen Goldstein

He discovered positively charged particles, but with no clear idea of why they existed and discovered canal rays.

 Sir Joseph John Thomson

 an equal number of positive and negative particles, he discovered electrons.

Ernest Rutherford

a positively charged center (nucleus)

who experimented the gold foil experiment

Ernest Rutherford

who coined the term protos or proton?

Ernest Rutherford

James Chadwick

He proved the

existence of “neutrons”.

Niels Bohr

electrons can only exist in specific energy levels

Erwin Schrödinger

Electrons move in regions called electron clouds or orbitals

Democritus & Leucippus

He believed that “atoms are physically indivisible.”