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Democritus
Was the first person to propose the idea that matter was not infinitely divisble. He believed matter was made up of tiny individual particles called atomos. YEAR: 460-370 BC -
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Aristotle
One of the most influnetial greek phiolsophers rejected theory, because it didn't agree with his own ideas on nature. He did not belieed that the nothingess of empty space could exist. 384-322 BC -
Sep 24, 632
Muhammad dies
leader of muslim faith dies. -
Declaration of Independence
Was written by the patriots on this day. -
Antonie Lavosier
is recognized as the father of medrn chemistry. His experiments led to the law of the conservation of mass. He also defined the process of respiration. -
Joesph Proust
Introduced the law of definite proportions. -
John Dalton
All matter is composed of extremely small particles called atoms. all atoms of a given element are identical, having the same size, mass, and chemical properties. Modern atom theory -
Amaveo Avagardo
relationship between the masses of the same volume of different gases (at the same temperature and pressure) corresponds to the relationship between their respective molecular weights. -
Assassination of Abraham Lincoln
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William Crooks
Invented cathode ray. Crooks was able to create the 4th state of matter which is Plasma. -
JJ Thomson
Experimented and found that atoms were broken down into subatomic particles. This is when the electron was found. -
Henri Becquerel
Said that the penetrating radiation came from the uranium itself, without any need of excitation by an external energy source -
Max Planck
matter can gain or lose energy only in small, specific amounts called quanta. -
Madame Curie
Famous for her work with radioactivity. Discovered radium, and Polonium. -
Robert Millikan
Discoved the charge of the electron, and developed a formula to find the mass of the electron. -
The boy scouts are founded
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Ernest Rutherford
Developed a more modern and supported atom model, and figured out there is a nucleus in the middle of the atom. -
The mona lisa is stolen
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Niels Bohr
Proposed a quantum model for the hydrogen atom has only certain allowable energy states. Lowest is ground state, highest is excited state. -
Henry Moseley
Discovered that atoms of each element contain a unque postiive charge in their nuclei, and that the number of protons decided what element it was. -
Albert Einstein
facts about einsteinDeveloped the modern Theory of Realitivity. famous equation E=MC^2. -
Louis deBroglie
proposed an idea that accounted for the fixed energy levels of Bohr's model. He said that electrons acted like waves. -
Werner Heisenberg
concluded that it is impossible to make any measurement on an object without disturbing the object- at least a little. -
Erwin Schrodinger
furthered the wave-particle theory proposed by de Broglie. Derived an equation that treated the hydrogen aton's electron as a wave. -
James Chadwick
Discovered that there was another sub atomic particle called the neutron. And that it's mass was the same as the proton. -
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Color TV introduced
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Hubble Telescope Launched
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