History of atom

History of the Atom Timeline - Caleb Barton

By K'lub Barton
  • 450

    Democritus (460 B.C.)

    Democritus (460 B.C.)
    • Made the theory of atoms being smallest possible object.
    • The word atom is derived from the Greek word "atomos".
    "Atomic Models from Aristotle to Schroedinger." The Atom. Adamse@technologist.com, n.d. Web. 27 Feb. 2014. Harvey, Nicole. "Atoms." Lecture. Zachary Community School District: Login to the Site. Web. 27 Feb. 2014. Walker, Jim. "History of Atoms." History of Atoms. N.p., Sept. 1988. Web. 26 Feb. 2014.
  • 450

    Aristotle (380 B.C.)

    Aristotle (380 B.C.)
    • Dismissed Democritus's idea of atoms. -Claimed all matter is composed of proportions of the elements fire, earth, air, and water.
    • Reason behind little exploration into atoms for the next 2000 years.
    "Atomic Models from Aristotle to Schroedinger." The Atom. Adamse@technologist.com, n.d. Web. 27 Feb. 2014. Harvey, Nicole. "Atoms." Lecture. Zachary Community School District: Login to the Site. Web. 27 Feb. 2014. Walker, Jim. "History of Atoms." History of Atoms. N.p., Sept. 1988. Web. 26

  • John Dalton

    John Dalton
    • Made the modern atomic theory composed of 5 parts.
    • Dalton measured the masses of elements that reacted to form compounds to gather his evidence to support his atomic theory.
    • He believed atoms were little balls that could be arranged to form different things.
    "Atomic Models from Aristotle to Schroedinger." The Atom. Adamse@technologist.com, n.d. Web. 27 Feb. 2014. Walker, Jim. "History of Atoms." History of Atoms. N.p., Sept. 1988. Web. 26 Feb. 2014.

  • J.J. Thomson

    J.J. Thomson
    • He realized atoms are not indivisible. He acknowledged that atoms are composed of even smaller components (electrons and proton's force).
    • JJ gathered evidence using his cathode ray experiment.
    • Described the atom as a positively charged pudding with negatively charged raisins sprinkled throughout.
    Models of the Atom Timeline. Dir. Tyler Dewitt. YouTube. YouTube, 06 Dec. 2012. Web. 27 Feb. 2014. "Thomson's Model." Tutorvista.com. HCS Pearson, 2014. Web. 27 Feb. 2014.

  • Rutherford

    Rutherford
    • Made the discovery of the nucleus and proton belonging in the nucleus. -His model of the atom, "The Nuclear Model" shows this.
    • Rutherford based this on his famous gold-foil experiment.
    Walker, Jim. "History of Atoms." History of Atoms. N.p., Sept. 1988. Web. 26 Feb. 2014. "Atomic Models from Aristotle to Schroedinger." The Atom. Adamse@technologist.com, n.d. Web. 27 Feb. 2014.

  • Bohr

    Bohr
    • Stated that electrons orbit in circular orbitals around the nucleus like planets around a star.
    • This model Bohr made is named after him the "Bohr Model".
    Models of the Atom Timeline. Dir. Tyler Dewitt. YouTube. YouTube, 06 Dec. 2012. Web. 27 Feb. 2014.

  • Heisenburg and Schrodinger

    Heisenburg and Schrodinger
    • Stated electrons are not restricted to a circular orbital but instead have a orbital that completely surrounds the atom. -Wrote "The Uncertainty Principle" to help explain behavior of things at the atomic level. -Their model of the atom is called "The Quantum Mechanics Model".
    "Atomic Models from Aristotle to Schroedinger." The Atom. Adamse@technologist.com, n.d. Web. 27 Feb. 2014. Harvey, Nicole. "Atoms." Lecture. Zachary Community School District: Login to the Site. Web. 27 Feb. 2014.