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300
Democritus
Called the particles of matter atoms. -
John Dalton
proposed an atomic theory with spherical solid masses in motion. -
JJ Thompson
Found electron, described the atom as a ball of positive charge containing a number of electrons. -
Marie Curie
-Studied uranium and therium and called their decay process "radioactivity". -
Ernest Rutherford
- Found proton
- Used his "gold foil" experiment to determine that the nucleus of the atom is very dense and has a positive charge.
- Assumed that the electrons were outside the nucleus of the atom.
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Neils Bohr
-Explained the atomic structure of the atom as "succesive orbital shells of electrons"
-Model is known as te Bohr Planetary Model. -
Erwin Schrodinger
-Identified the electron cloud model.
-He made Schrodinger's wave equation.
The proper wave equation for the electron. It shows all the wave like properties of matter. It is used to allowed energy levels of atoms and other things like that. It plays the role of Newton's laws and conservation of energy. -
John Cockroft and Ernest Walton
-First to split an atom in a controlled manner. -
James Chadwick
-Discovered a particle within the nucleus that has a mass similar to that of a proton.
-He credited with discvering the neutron. -
Enrico Fermi
-Built the nuclear reactor at the University of Chicago. -
Harry Truman, 33rd President
-Gave the order to drop the atomic bombs on Hiroshima and Nagasaki. -
Building of the Atomic Bomb
-The voltage multiplier was one of the inventions that helped create the atomic bomb.
-Cockroft and Walton helped influence this idea. -
Nuclear Power Accident
-A reactor blew up in a nuclear power plant in Chernobyl.
-30 were instantly killed and 130,000 had to be evacuated due to the radiation levels.
