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300
Democtitus
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John Dalton
He said an atomic theory with spheric solid masses in motion. -
JJ Thomson
He described an atom as a ball of positive charge containing a number of electrons. -
Ernest Rutherford
He used his "Gold Foil" experiments to determine that the nucleus of the atom is very dence and has a positive charge. -
Neil Bohr
He explained the atomic structures on the atom as "Sucessive orbital shells of electrons." The model is known as The Bohr Planetary Model. -
Ernest Walton and John Cockroft
They discovered the neutron, weeks later, they split the atom. -
Chadwick
He discovered a particle within the neucleus that has a mass similar to that of a proton. -
Hiroshima Bombing
On August 6, 1945, the United States used a massive, atomic weapon against Hiroshima, Japan. This atomic bomb, the equivalent of 20,000 tons of TNT, flattened the city, killing tens of thousands of civilians. While Japan was still trying to comprehend this devastation three days later, the United States struck again, this time, on Nagasaki. -
Chernobyl Disaster
The Chernobyl Power Plant exploded. Further explosions and fires sent a plume of highly radioactive fallout into the atmosphere. Four times more than Hiroshima. -
Schrodinger
He made a powerful model of an atom.
