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Jan 1, 1000
Democritus
415 B.C. The first person to come up with theory that different kinds of atoms have different shapes. Also realized that matter was made up of small individual atomos. -
Jan 1, 1000
Aristotle
353 B.C. Disagreed with Democritus' theory. Aristotle's theory said that matter could be divided an infinite number of times. -
Antoine Lavosier
First person to make good use of a balance. He also proposed the Combustion Theory and named oxygen and came up with the Law of Conservation of Mass. -
Joseph Proust
Joseph proposed the Law of Constant Composition. -
John Dalton
Did many experiments with different chemicals. With these experiments he came up with the atomic theory. -
Amadeo Avagadro
Proposed the Avagadro's Hypothesis that stated that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms. -
First Vulcanized Rubber Soccer Ball
Charles Goodyear patented the first vulcanized rubber soccer ball in this year. -
First Rules of Soccer
The modern version of the game was standardized by the English on this date. -
First Soccer Organization
On this date many soccer clubs got together and formed the first major soccer club. -
Iowa State's First Class of Graduates
The first class of students from Iowa State University graduated this on year. -
William Crookes
Studied cathode ray tubes which are negatively charged. By studying these he learned about deflection of cathode rays by magnetic fields. -
Henri Becquerel
He discovered that uranium containing minerals produced x-ray radiation. -
Utah's Admittance
On this date Utah was admitted as the 45th U.S. State. -
J.J. Thompson
Discovered the electron and made a structure for them. He knew that electrons had a negative charge so he came to the conclusion that matter had a positive charge. -
Madame (Marie) Curie
She studied uranium and thorium and called the spontaneous decay process "radioactivity". She and her husband discovered the radioactive elements polonium and radium. -
Max Planck
Discovered the quanta. He noticed that when atoms vibrate long enough you can measure their energy only in discrete units called quantas. -
Albert Einstein
He published the famous equation E=mc2 and the Theory of General Relativity. -
Robert Millikan
Robert determined the charge of an electron using his oil drop apparatus. -
Ernest Rutherford
He realized that atoms must get scattered by small pieces of positively charged matter. So he concluded that electrons must exist somewhere. Then in 1920 he discovered the name proton. -
Henry Moseley
He concluded that the atomic number was equal to the positive charge of an atom. -
Niels Bohr
He made a more accurate model of the atom. -
Louis de Brogile
He introduced that wave/particle durality of matter. -
Werner Heisenberg
He came up with the Heisenberg Uncertainty Principle which takes away the idea of electrons traveling around in neat orbits. Any electron that is subjected to photons will have its momentum and position affected. -
Erwin Schrodinger
Used Brogile and other's ideas and made an equation. Solving the equation can predict the properties and reactivities of all atoms and molecules. -
James Chadwick
James discovered the neutron. He also proved that neutrons, neutral particles in the nucleus made up approximately half the mass of an atom, actually did exist. -
Pearl Harbor
The attack on pearl harbor by Japanese Imperial General Headquarters. -
First Computer
The first computer was made at Iowa State University. -
Radium E.
Radium E. becomes the radiactive element to be made synthetically. -
5th Winter Olympics
The 5th Winter Olympic began in St. Moritz, Switzerland. -
Start of the Korean War
The Korean war started on this date and ended on July 27, 1953.
