History of The Atom Timeline by Kaitlynn White

By kaitlynn.white2018
  • Period: 300 to

    History of the Atom

  • 400

    Democritus (400BC)

    Democritus (400BC)
    Democritus made the fully developed philosophy of the atom, and that the atom had a positive center. He got his theories from observation. He thought the atom was a small substance with no molecules or anything in it. Saffman, Mark. "Atom." Development of the Atom. N.p.: n.p., 2015. World Book. Web. 24 Feb. 2015.

  • Dalton (1803)

    Dalton (1803)
    Dalton had made his own atomic theory, and he said that each element consists of a particular kind of atom. He thought that all atoms of a given element are identical in size, shape, and mass. Saffman, Mark. "Atom." Development of the Atom. N.p.: n.p., 2015. World Book. Web. 24 Feb. 2015.

  • Thomson (1897)

    Thomson (1897)
    Thomson discovered that atoms are cuttable. He also discovered the electron, and that they are part of the atom, and that electrons are negatively charged within a positively charged sphere. He made a model, stating that negatively charged electrons were embedded into the positively charged sphere.
    Saffman, Mark. "Atom." Development of the Atom. N.p.: n.p., 2015. World Book. Web. 24 Feb. 2015.
    Saffman, Mark. "Atom." Development of the Atom. N.p.: n.p., 2015. World Book. Web. 24 Feb. 2015.

  • Rutherford (1911)

    Rutherford (1911)
    Rutherford broke up the nucleus of an atom, and said that atoms are constructed like the solar system. To come up with this theory, he took other theories and made his own evidence. To him, the atom had a nucleus and electrons in the outer part.
    Stuewer, Roger H. "Rutherford." Rutherford. N.p.: n.p., n.d. World Book. Web. 24 Feb. 25.

  • Bohr (1913)

    Bohr (1913)
    Bohr said that electrons whirled around the nucleus, and that electrons could only travel a certain way, He developed his own theory, and to him, the atom looked like this; electrons were travelling in one direction around the nucleus, like a circle.
    Stanley, Matthew. "Bohr Neils." Bohr Neils. Chicago: n.p., n.d. World Book. Web. 24 Feb. 2015.

  • Heisenberg and Schrodinger (1927)

    Heisenberg and Schrodinger (1927)
    Schrodinger showed that electrons are really waves. They looked at Dalton's model and went from there, gathering evidence to conclude their theory. The theory of what the atom looked like was that electrons had wave patterns and a nucleus.
    Allain, Rhett. "The Development of the Atomic Model." Dot Physics. Rhett Allain, 4 Sept. 2009. Web. 24 Feb. 2015.