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proposed the idea that matter was not infinitely divisible. He believed matter was made up of tiny individual particles called atomos. Democritus believed that atoms could not be created, destroyed, or further divided
460 BC -
declares existence of 4 elements air, fire, water, earth and two alternatives hot & cold, and dry & moist
638 BC -
The Magna Carta is a document that King John of England was forced into signing. The purpose of the Magna Carta was to curb the King and make him govern by the old English laws that had prevailed before the Normans came. he Magna Carta demonstrated that the power of the king could be limited by a written grant.
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invented by Johannes Guttenberg and it made printing books, newspapers, etc faster to make and cheaper for the citizens
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one of the best writer of all time dies and leaeves behind 38 plays, 154 sonnets, two long narrative poems, and several other poems
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battle between britian and the US for freedom from britian
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mass conserved through course of chemical reaction
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Law of Definite Proportions
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the US bought the Louisiana purchase from France and it nearly doubled the size of the US
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daltons atomic theory
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Avogadro's law, states that equal volumes of gases, at the same temperature and pressure, contain the same number of molecules
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war between the US and Great Britian over the impressment of US sailors into the British Navy
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Gold was found in California and many people rushed to California to try and get rich off of gold
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theory of radiant matter, cathode rays
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helped discover radiation
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determine the charge-to-mass ratio of the charged particle, discovery of the electron and of isotopes
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thermodynamics, E=hv, black body radiation equation, matter can gain or lose energy only in small, specific amounts called quanta. That is, a quantum is the minimum amount of energy that can be gained or lost by an atom
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theory of special relativity, the photoelectric effect, Brownian motion
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discovered charge of electron
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studied alpha particles
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researched radium, discovered radium and polonium, helped discover radiation
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discovered that atoms of each element contain a unique positive charge in their nuclei
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archduke Francis Ferdinand was assassinated and the nations went to war to avenge his death including German, Austria-Hungary, Ottoman Empire, Bulgaria, Serbia, Russia, France, Britain, Belgium, Romania, US, and Italy
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made the Bohr model an atom, the theory that electrons travel in discrete orbits around the atom's nucleus.
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researched quantum theory, discovered wave nature of electrons
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the uncertainty principle and theory of quantum mechanics
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quantum mechanical model of the atom, The Schrödinger equation, and Schrödinger's cat
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discovered the neutron
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bomb dropped on Hiroshima and Nagasaki Japan which made them surrender from WW2
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al-Qaeda hijacked four passenger jets. The hijackers intentionally crashed two planes into the Twin Towers of the World Trade Center in New York City; both towers collapsed within two hours. Hijackers crashed American Airlines Flight 77 into the Pentagon in Arlington, Virginia. The fourth jet, United Airlines Flight 93, crashed into a field near Shanksville, Pennsylvania, after passengers attempted to take control before it could reach
