-
450
Democritus' Discovery (460)
Democritus pondered the thought about how far a piece of matter could be broken down until it no longer could be broken down. He believed that the atom looked like a marble. -
450
Aristotle's Atomic Theory (400)
Whenever Aristotle heard of Democritus' theory, he thought of it as foolish and did not support it. He believed that all matter was made up of fire, earth, air, and water and had many supporters because of his achievements in his career. Since he could not set up a scientific experiment, he did not have any proof. -
Daulton's Discovery on Atoms
Daulton believed that all matter is made up of atoms. Not only that, but he tried to come up with atomic structures. Most people believe that his discoveries were based off of his studies on gas solubility, gas mixtures, vapor pressure, and meteorology. Daulton believed the atom looked like tiny balls. -
Thomson's Theory
John Thomson discovered the electron using a cathode- ray rube. Thomson thought the atom looked like a sphere of positive forces with electrons surrounding it. This model is known as the Plum Pudding Model. -
Rutherford's "Planet" Atom
Rutherford is credited with discovering the nucleus.This discovery was due to a gold foil experiment where various charges were aimed in all directions. Ernest believed that the atom looked like a planetary system which is called the Nuclear Model. -
Bohr's Atomic Theory
Bohr discovered that protons are in the nucleus and electrons are surrounding the nucleus. He also believed that electrons move in a certain path and the chemical property of an atom is determined by the valence electrons. He used the constant formula h=6.6X10 to the -34th power to find energy levels of Hydrogen.He also thought atom looked like a planetary system. -
Heisenberg's Atomic Theory
Heisenberg found matrice and concluded that electrons are particles, not waves. This was known as the Heisenberg Uncertainty Principle. He claimed that there was no experiment that could measure the position or speed of a quantum paritcle at the same time. He believed the atom had a nucleus with electrons surrounding it like a cloud It was later known as the Electron Cloud model. -
Schrodinger's Atomic Theory
Schrodinger believed that that particles move in waves, that an atom can be unstable or stable, and thought that the waves could be altered by external influences. He gathered this theory based on his observations of the behavior of an atom. His model is called the Quantum Mechanical model and the atom has a nucleus with electrons hovering around the nucleus. -
Picture Bibliography Sources
"Chemistry." 26 Feb. 2014 http://chemistry.tutorvista.com/inorganic-chemistry/bohr-s-model-of-the-atom.html.
"Democritus." The-History-of-the-Atom -. 26 Feb. 2014 http://the-history-of-the-atom.wikispaces.com/Democritus.
"Aristotle." The-History-of-the-Atom -. 26 Feb. 2014 http://the-history-of-the-atom.wikispaces.com/Aristotle.
"Rutherford model of the atom." Rutherford model of the atom. 26 Feb. 2014 http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/rutherford-model.html. -
Picture Bibliography Sources Ctd.
"Glogster Home page." Glogster. 26 Feb. 2014 http://www.glogster.com/lucibubblegum/chemistry-project-dalton-s-atomic-model/g-6lv78l0pdj9qii0rpbafsa0.
"Don’t Be Dissin’ the Bohr Model!" Scientific American Global RSS. 26 Feb. 2014 http://blogs.scientificamerican.com/cocktail-party-physics/2012/02/09/dont-be-dissin-the-bohr-model/. -
Bibliography Sources
"Atomic Structure Timeline." Atomic Structure Timeline. 25 Feb. 2014 http://atomictimeline.net/index.php.
"Dalton Atomic Theory." 26 Feb. 2014 http://www.rsc.org/chemsoc/timeline/pages/1803.html.
DeWitt, Tyler. "Models of the Atom Timeline." YouTube. 06 Dec. 2012. YouTube. 26 Feb. 2014 https://www.youtube.com/watch?v=NSAgLvKOPLQ.
"Discovery of the Electron: J.J. Thomson." 26 Feb. 2014 http://web.lemoyne.edu/~giunta/EA/THOMSONann.HTML.
Harvey, Nicole. "Harvey's Moodle Page." -
Bibliography Sources Ctd.
"John Dalton." 26 Feb. 2014 http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/the-path-to-the-periodic-table/dalton.aspx.
"John Thomson." 26 Feb. 2014 http://www.chemheritage.org/discover/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx. -
Picture Sources Ctd.
"Where did Schrödinger solve the radiating problem of Bohr's model?" Quantum mechanics. 26 Feb. 2014 http://physics.stackexchange.com/questions/68381/where-did-schrodinger-solve-the-radiating-problem-of-bohrs-model.
"Atoms: Their Inner Workings." Of Particular Significance. 26 Feb. 2014 http://profmattstrassler.com/articles-and-posts/particle-physics-basics/the-structure-of-matter/atoms-building-blocks-of-molecules/atoms-their-inner-workings/.
