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The Periodic Table
Dimitri Mendeleef comes up with the periodic table of elements. -
Quantum Theory
Max Planck publishes paper on quantum theory. -
Discovery of Proton
Ernest Rutherford discovers proton. -
Neutron
James Chadwick discovers neutron in nucleus. -
Franklin Roosevelt begins Manhattan Project
The construction of the first Atomic Bomb begins in the United States. -
A-Bomb
First ever Atomic Bomb is exploded in Alamogordo, New Mexico.