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(1743-1789) He discovered elements, formulated a basic law of chemistry and helped create the metric system.
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(1754-1826) He was a French chemist who became known for helping prove the idea that every pure chemical compound consists of elements in a definite proportion.
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John's atomic theory was a break- through in our understanding of matter. He came up wiith that all matter is composed of extremely small particles called atoms. Also atoms cannot be created, divided into smaller particles, or destroyed. Different atoms combine in simple whole- number ratios to form compounds. http://www.youtube.com/watch?v=wsYDL6EjV4k
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(1776-1856) Amedeo Avogadro is most famous for his contributions to theory of moles and molecular weight, including what is known as Avogadro’s law. In respect of his contributions to the molecular theory, the number of molecules in one mole was renamed Avogadro’s number.
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Invented the battery.
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Invented the electromagnet.
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Invented modern matches.
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Invented the sewing machine.
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Patented the stapler.
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Invented the safety pin.
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J.J. began a series of cathode ray tube experiments in the late 1890s to determine the ratio of its charge to its mass; by carefully measuring the effect of both magnetic and electric fields on a cathode ray, He was able to determine the charge-to-mass ratio of the charged particle. He then compared that ratio to other known ratios. He also Invented the plum pudding model. He also identified the particle electron.
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(1832-1919) In the 1870's he developed a pump that would create a better vacuum than had been possible before.
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Invented the machine gun.
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(1887–1915) Henry discovered that atoms of each element contain a positive charge in their nuclei; the number of protons in an atom identifies it as an atom of a particular element. The number of protons in an atom is the element’s atomic number.
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(1887-1961) Erwin Schrodinger bequeathed to scientific posterity the foundations of the study of wave mechanics, crucial to understanding the behavior of subatomic particles and light. Many students are familiar with the mind experiment known as Schrödinger’s Cat.
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(1891–1974) James showed that the nucleus also contained another subatomic particle called the neutron.
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Invented the escalator.
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Invented the zipper.
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Patented the roller coaster.
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On Decemeber 14, 1900, he announced his Quantum Theory and presented his findings to the German Physical Society,
– h = 6.55 x 10-²7 (erg sec) which was when the Quantum Theory was born. -
(1852-1908) He was the discoverer of radioactivity, for which he also won the 1903 Nobel Prize in Physics.
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Marie Curie is famous for her radioactive metals discovery. These metals included Radium and Polonium and she was also the first person honoured with two Nobel Prizes in both physics and chemistry in 1903.
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Albert Einstein is well known for his scientific studies. He is sometimes referred to as a 'father of the atomic age'. He formulated the Theory of Relativity in 1905 and also studied the movements of molecules in liquids, in order to calculate what causes the Brownian motion. http://www.youtube.com/watch?v=ZMVKvO-gTs8
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(1871–1937) By 1908, Rutherford won the Nobel Prize in chemistry and had many other discoveries to his credit. Three years latter he became interested in studying how positively charged alpha particles interacted with solid matter.
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1868–1953) Robert determined the charge of an electron. He also calculated the mass of a single electron.
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In 1913, Bohr’s model of atomic structure was published which became the basis of the famous quantum theory.
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Louis deBroglie had a doctoral thesis in 1924 explained that wave equations also apply to particles. Broglie showed that every material object is associated with a wave, most observable for small bits of matter, such as electrons. By 1926 Broglie's waves, showing the predicted properties, had been found.
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Werner Heisenberg was a German physicist and philosopher who is noted for his crucial contributions to quantum mechanics. He devised a method to formulate quantum mechanics in terms of matrices, for which he was awarded the 1932 Nobel Prize for Physics.
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(460–370 B.C.) Democritus was the first person to propose the idea that matter was not infinitely divisible. He believed matter was made up of tiny individual particles called atomos. Democritus also believed that atoms could not be created, destroyed, or divided.
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Most of Aristotle's writings have been lost through
the ages, but one of Aristotle’s major criticisms concerned the idea that atoms moved through empty space. He did not believe that the nothingness of empty space could exist.
