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Believed that matter is composed of empty space through which atoms move. Atoms are solid, homogeneous, indestructible, and indivisible, atoms are different sizes and shapes, different types of matter=different types of atoms, changing matter is a result of atoms shifting, not changing.
460 B.C. -
Didn't believe that the “nothingness” that atoms float in actually exists. Did not agree with Democritus, and eventually his ideas were rejected.
384 B.C. -
A time in America when technology soared and new things were being built and creating products became more efficient.
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Compiled a list of elemenets known at that time. This contained 23 elements.
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Created Law of Definite Proportions, which stated that the proportion by the masses of two give elements would always remain the same.
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He believed that all matter is composed of atoms, all atoms of a given element are the same size, mass, and chemical properties. Atoms of one element are different than ones of another. Atoms can't be created, divided or destroyed. In a chemical reaction atoms are separated, combined, or rearranged.
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Discovered Radiation
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said that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.
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Alexander Wolcott patented his idea for the camera.
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Discovered that penetrating radiation came from the uranium itself, without need of excitation by an external energy source.
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Did a series of cathode ray tube experiments to determine that ratio of its charge to its mass. He discovered there were molecules smaller than the atom.
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Discovered that the ability to radiate does not depend on the arrangement of the atoms in a molecule, it must be linked to the interior of the atom.
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Matter can gain or lose energy only in small, specific amounts called quanta.
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Found that electromagnetic radiation has both wavelike and particle-like natures.
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Determined the charge of an electron. Calculated th mass of an electron.
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Found that atoms in gold deflect alpha particles.
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Made a quantum model for the hydrogen atom that predicted the frequencies of the lines in hydrogen's atomic emission spectrum. Also related the hydrogen atom's energy states to the motion of the electron within the atom.
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War between the “Entente Powers” (U.S., U.K., Russia,Japan, Italy, France, China, Brazil, etc.) and the “Central Powers” (Austria-Hungary, Azerbaijan, Bulgaria, Dervish state, Germany, Ottoman Empire)
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Said that only whole numbers of wavelenths are allowed in a circular orbit of fixed radius. He also said that light has both wave and particle characteristics.
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Created the Quantum Mechanical Model of the Atom.
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the first colored system was introduced by John Logie Biaird
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A severe worldwide economic depression that was right before WWII.
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Showed that the nucleus also contained another subatomic particle, a neutral particle called the neutron.
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Discovered that atoms of each element contain a unique positive charge in their nuclei.
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Adolf Hitler wanted to gain control of Germany and Europe. He killed hundreds of thousands of innocent people with the Nazi's at his side. Fought between the Axis and the Allies.
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The country of Japan bombed a Naval base in Oahu, Hawaii, bringing us into WWII.
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concluded that it is impossible to make any measurement on an object without disturbing the object.
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A war between Vietanm and the U.S.
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Neil Armstrong and “Buzz” Aldrin were sent up by the U.S. To become the first men to ever step foot on the moon.
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Konrad Zuse made the first freely programmable computer.
