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Atom - Development, Theory, Structure: The concept of the atom that Western scientists accepted in broad outline from the 1600s until about 1900 originated with Greek philosophers in the 5th century bce.
The structure of atoms is somehow related to electricity. (p.95) Discovered atoms have negative particles (electrons) using a cathode ray tube. Discovered electron’s charge to mass ratio: 1.76 x 108 C/g. (p. 97-98) Thomson’s Plum Pudding Model, 1900.
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Timeline. c. 424 BCE - 423 BCE. Plato is born at Athens, Greece . 399 BCE. Trial and death of the philosopher Socrates, who taught in the court of the Agora . 384 BCE. Birth of the philosopher Aristotle, tutor to Alexander the Great, in Stagira ( Greece ). 384 BCE - 322 BCE. Life of Aristotle .
- Joshua J. Mark
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History of atomic theory. The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic "cloud" of electrons. Atomic theory is the scientific theory that matter is composed of particles called atoms. The definition of the word "atom" has changed over the years in response to scientific discoveries.
Use postulates of Dalton’s atomic theory to explain the laws of definite and multiple proportions. Outline milestones in the development of modern atomic theory. Summarize and interpret the results of the experiments of Thomson, Millikan, and Rutherford.
atomic model, in physics, a model used to describe the structure and makeup of an atom. Atomic models have gone through many changes over time, evolving as necessary to fit experimental data. For a more in-depth discussion of the history of atomic models, see atom: development of atomic theory.
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Feb 20, 2022 · The first truly direct evidence of atoms is credited to Robert Brown, a Scottish botanist. In 1827, he noticed that tiny pollen grains suspended in still water moved about in complex paths. This can be observed with a microscope for any small particles in a fluid.
