HISTORY OF ATOMIC THEORY
I. Ancient Greeks
A. Aristotle
~ believed there were 4 elements:
B. Democritus
~ believed in the "particle theory":
~ named the small particles "atoms" which means
II.
A. Father of Atomic Theory
B. Matter
is composed of atoms
C. Points to his
theory
~ atoms of an element
~ in chemical reactions,
III. Thomson (1897)
A. discovered the
B. used a
IV. Millikan (1909)
A. discovered
electrons have
B. his
experiment called
V.
A. discovered
B. his experiment called
VI. Bohr (1913)
A. electrons
B. his model called
C. energy must be
VII. Chadwick (1932)
A. discovered
VIII. Progression of the atomic model
Democritus/Dalton
--> Thomson -->&nbssp;