Development of the Atomic Theor

Atomos

440

Everything is made up of solid ball called Atomos
-Democritus

4 element

Jun 12, 1617

Fire, water, earth, wind
-Aristotle

Dalton’s Atomic theory based on experiment

Dec 31, 1700

Element combine in certain proportions based on mass to form compounds
-Dalton

Thomson’s Discovery of electrons

Mar 12, 1892

There’s small particle inside atom
-Thomson

Far from the nucleus

Feb 25, 1911

nucleus is the center of atom its 100,000 time smaller than atom
-rutherford

Bohr’s electron levels

Aug 11, 1913

Atom react to light
-Bohr