Atoms History

Timeline created by alejandrorm
  • John Dalton

    John Dalton s theory says that all matter is composed by atoms, atoms cannot be made or destroyed, different elements have different type of atoms, also that reactions occure when atoms are rearranged, and that compounds are formed from atomos of the constituent element.
  • Daltons Atomic Model

    Daltons Atomic Model
  • William Crookes

    William Crookes
    William created a better vaccum pump to produce cathode-ray
    tubes with a smaller residual gas pressure. He found out that cathode rays are negatively charged.
  • William Crocks Atomic model

    William Crocks Atomic model
  • J.J Thomson

    J.J Thomson
    J:J Thomson discovered the electron studying electric discharge in a high-vacuum cathode-ray tube. Later in 1904 Thomson suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces.
  • J.J Thomson atomic model

    J.J Thomson atomic model
  • Ernest Rutherford

    Ernest Rutherford
    Ernest theory is that the atom has a central postive nucleus surounded by negative orbiting electrons. The gold foil experiment "Involved the firing of radioactive particles through minutely thin metal foils (notably gold) and detecting them using screens coated with zinc sulfide (a scintillator)." said a scientist of Chemsoc Timeline.
  • Rutherfords Model

    Rutherfords Model
  • Neils Bohr

    Neils Bohr
    Neils assumed that electrons traveled in stationary orbits defined by their angular momentum. He also developed an explanation of atomic structure that contributed to the periodic table of elements.
  • Bohrs Model

    Bohrs Model
  • James Chadwick

    James Chadwick
    James predicted the atom would have a neutron. He also established that atomic number is determined by the numbers of protons in an atom. Famous for discovering neutron in atom.
  • bibliography

    -Brown, Andrew (1997). The Neutron and the Bomb: a Biography of Sir James Chadwick. Oxford [Oxfordshire]: Oxford University Press. ISBN 0-19-853992-4.
    -"Niels Bohr Archive". Niels Bohr Archive. February 2002. Retrieved 2 March 2013.
    -Bernard Pullman (1998) The Atom in the History of Human Thought, trans. by Axel Reisinger. Oxford Univ. Press.
    Eric Scerri (2007) The Periodic Table, Its Story and Its Significance, Oxford University Press, New York.