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Around 440 BCE Theory of Perception: thin layers of atoms sloughed off and released air borne into the eye and that’s why we see
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Principle of scientific epistemology which is the role of senses, abstraction, laws of logic, types of reasoning, and rules for deductive reasoning 384-322 BC
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Henry I is crowned King of England in Westminster Abbey.
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Discovery of America
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Found and termed oxygen
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found and termed hydrogen
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Proved wrong Berthollet's theory with law of definite proportions theory
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Verbally expressed relative atomic weights, supporting his theory; all elements made of atoms, atoms of the same element are the same in sixe shape and properties, atoms can not be subdivided, created, or destroyed, toms of different elements combine in whole number ratios, and in chemical reactions, atoms are combined, rearranged, and seperated.
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Corrected Dalton's flaw in his theory.
Mole Concept. Avogadro's number: 6.02 x 10^23 -
Iowa admitted 29th state
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Good Friday President Lincoln was assinated. Shot in the back of the head by John Wilkes Booth
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dentified first sample of helium
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investigate phosphorescence in uranium salts
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credited with discovery of electron
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Modern Quantum Thoery: EM Radiation also has particle nature exhibiting wave particle duality Planck’s Constant: 6.63x10^ -34 kgm^2/sec
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Nobel Peace Prize in Physics
Discovered Radioactivity -
Special theory of relativity, All matter is equivalent to a discrete amount of energy
E=mc^2 -
Oil Drop Experiment: tested to see size of electric charge on a single electron
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Model of atom
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Gold Foil Experiment
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Nobel Peace Prize Chemistry
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Planetary model of atom. Electrons orbit in definite energy levels which at a quantized fixed distance from nucleus.
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Re-arranged periodic table based on ohysics of elements
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proposed without evidence that all particles of matter should have wave properties and thus exhibit wave-particle duality
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Uncertainty Principle
Particles are also waves which means they have no point location and are spread out over a region -
Wave mechanical model of atom
Equation to describe wave nature
Schrodinger Wave Equation -
Nobel Peace Prize in Physics
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U.S. declares war
against Japan -
Invented by mathematics and physics professor John Atanasoff and engineering graduate student Clifford Berry during 1937-42, the Atanasoff-Berry Computer, or ABC, pioneered important elements of modern computing, including binary arithmetic, regenerative memory, parallel processing, electronic switching elements, and separation of memory and computer functions.[30]
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Commander Neil Armstrong became the first man on the moon. He said the historic words, "That's one small step for a man, one giant leap for mankind."
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