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460
Democritus
460 B.C. Democritus, an Ancient Greek Philosopher created the first atomic theory. -
Declaration of Independence
Delcaration of Independence -
Joseph Proust
Came up with the Law of Constant Composition, which stated that the composition of a substance is always the same. -
John Dalton
In 1803, John Dalton came up with the atomic theory that said, all matter was composed of small indivisible particles termed atoms, atoms of a given element possess specific characteristics and weight, and there are three types of atoms which are simple, compound, and complex. -
Civil War
Civil War -
Henri Becquerel
Henri Becquerel discovered natural radioactivity and showed that the rays emitted by uranium, caused gases to ionize aand this dependedon the type ofX-ray in and could be deflected by electric or magnetic fields. -
J.J. Thompson
In the year of 1897, J.J. Thomson discovered the electron and created the cathode ray, which passes electric currents throught gases at a low pressure. -
Paper Clip
Paper Clip invented -
Max Planck
Plank proposed that energy had a resonator of frequency (v) is hv where (h) is a universal constant, which is now known as Planck's constant. -
First airplane to take off
Wilbur and Orville Wrightsucceeded in flying an airplane they built for 12 seconds -
Ernest Rutherford
Rutherford came up with a new atomic model that showed the atom is almost empty but protons and neutrons are inside a nucleus located in the middle. -
Neils Bohr
Introduced that electrons orbit around the nucleus of an atom. -
World War I
July 28, 1914 - November 11,1918 -
Robert Millikan
Millikan found out what the charge was carried by an electron by using the elegant "falling-drop" method and that it was true for all electrons. -
Louis de Broglie
Louis de Broglie claimed that particles and electrons all have waves, just like light. -
Werner Heisenberg
Heisenberg stated that you cannot give an electron a position in space at a given time, nor follow it in its orbit, -
Erwin Schrödinger
With the help of some of Albert Einsteins notes, Erwin Schrödinger began to think of ways to describe how an electron moves in a wave-like motion. In the year 1926, he proposed a theory using Neil Bohr's atomic model, which then became known as Schrödinger's wave equation -
The Gret Depression
The Great Depression -
James Chadwick
Chadwick discovers neutrons exist and come to the conclusion that they are in the nucleus with the protons and have no charge. -
World War II
September 1, 1939 -September 16, 1945 -
NASA
NASA is founded on October 3, 1958 -
Kennedy Assassination
Kennedy Assassination -
Apollo 11 Moon Landing
Apollo 11 Moon Landing -
Aristotle
384 BC. Aristotle, an Ancient Greek philosopher and scientist believed that air, earth, water, and fire ccould be broken down into more matter.
