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400
Atoms first introduced
Democritus states that all matter is made up of particles called atoms. -
John Dalton
Said that atoms are identical and have the same mass. -
Electricity and Electrons
George Johnstone Stoney discovered that electricity was made of negatively charged particles, later known as electrons. -
Light Bulb Invented
Thomas Edison demonstrates his light bulb that glows for forty hours. Electricity is used to power the light bulb -
Cathode Ray Tube Invented
Karl Ferdidnand Braun introduced the cathode ray tube with a flourescent tube. -
Thomson's Atomic Theory
J J Thomson said that the atom was postively charged and contained negatively charged particles called electrons. -
Gold Foil Experiment
Ernest Rutherford used the gold foil experiment to find that the nucleus is dense and positive charged. He discovered the proton. -
Electron Orbitals
Neils Bohr said the atomic structure of an atom as "successive orbital shells of electron". -
Behavior of sub-atomic particles
Erwin Schrodinger said that an electron's movement was like that of a wave. -
Television Invented
John Logie Baird publicly demonstrates his television. The television uses the cathode ray tube. -
Discovery of the Neutron
James Chadwick discovered the neutron -
Splitting the Atom
John Crofton and Ernest Walton split the atom's nucleus, proving Einstein's theory of relitivity. -
Hiroshima Bombed
Little Boy is dropped on the enemy city of Hiroshima, Japan and kills 100,000 people during WWII. The atomic bomb was made by splitting the atom.
