Atomic Theory Timeline
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Aristotle
Democritus
Antoine Lavoisier
John Dalton
Sir JJ Thompson
Robert Millikan
Sir Earnest Rutherford
Neils Bohr
Sir James Chadwick
Erwin Schrodinger
Wolfgang Pauli
Friedrich Hund
The Aufbau Principle
Albert Einstein
Otto Hahn, Lise Meitner, and Fritz Strassman
Sir James Chadwick
1932
English
Contributions
He discovered neutrons.
Can split nuclei.
Allowed for fission and creation of bombs.
Neutrons
Differed from alpha rays and repel consioderable electric fprces that are in the nucleus of heavy atoms.