Atom timeline pic

History of the Atom Timeline by Collin Dupuy and Dina Dinh

By collin.dupuy2017
  • 450

    Democritus (c. 460 BC)

    Democritus (c. 460 BC)
    He said that the atom is the smallest unit of matter on earth. He also believes that atoms cannot be destroyed and they cannot change.
    Methods:
    -Thinking about how things are made up.
    -Thought that if he were to break up a piece of matter, until it cannot be broken down anymore, he would get an atom.
    DeWitt, Tyler. "Models of the Atom Timeline." YouTube. YouTube, 06 Dec. 2012.
    "Atomic Models." Atomic Models. N.p., n.d. Web. 27 Feb. 2014.
  • 450

    Aristotle (c. 350 BC)

    Aristotle (c. 350 BC)
    He said that atoms did not exist. He also said atoms would fall down like rocks and believed that everything wass made from either dryness, wetness, heat, and coldness.
    Methods:
    - He didn't agree with Democritus, so he came up with the idea that everything was made from dryness, wetness, heat, and coldness.
    DeWitt, Tyler. "Models of the Atom Timeline." YouTube.
    YouTube, 06 Dec. 2012. Web. 27 Feb. 2014.
    "Physical Science (316)." ThinkQuest : Category. N.p., n.d. Web. 27 Feb. 2014.

  • Dalton

    Dalton
    He believed that everything was made up of atoms. He also said that atoms can't be created or destroyed. Dalton said that atoms arranged in different combonatinons to make different compunds and said that atoms were tiny and invisible.
    Methods:
    - Conducted the first scientific experiment and imagined what they looked like.
    DeWitt, Tyler. "Models of the Atom Timeline." YouTube.
    YouTube, 06 Dec. 2012. Web. 27 Feb. 2014.
    "Dalton Atomic Theory." Dalton Atomic Theory. N.p., n.d. Web. 25 Feb. 2014

  • Thomson

    Thomson
    Thomson discovered that e- are much smaller then an atom. He says that atoms wren't invisible because they are made up of electrons.
    Methods:
    -imagined it like a blueberry muffin
    -When split in half, there would be e- stuck in it like a blueberry muffin and the dough would be positively charged
    - The negative and positive would balance each other out
    making the atom neutral
    DeWitt, Tyler. "Models of the Atom Timeline." YouTube. YouTube, 06 Dec. 2012. Web. 27 Feb. 2014. used other citation prev.

  • Rutherford

    Rutherford
    Rutherford found out that e- orbited the nucleus in an atom. He said that the center (nucleus) was positively charged and that the atom would collapse as the e- orbited around th nucleus
    Methods:
    - He used the gold foil experiment by shooting a stream of alpha particles at the gold foil.
    DeWitt, Tyler. "Models of the Atom Timeline." YouTube. YouTube, 06 Dec. 2012. Web. 27 Feb. 2014.
    "Atomic Models." Atomic Models. N.p., n.d. Web. 27 Feb. 2014.

  • Bohr

    Bohr
    Bohr said that electrons orbited the nucleus in a fixed path.
    Methods:
    He used Rutherford's model and added electrons to e- shells
    -Used spectrum of light to discover that e- are in fixed paths.
    -saw that electrons give off light when they change direction and used this in his theory.
    DeWitt, Tyler. "Models of the Atom Timeline." YouTube. YouTube, 06 Dec. 2012. Web. 27 Feb. 2014.
    "Bohr Atomic Model: Nitrogen Atom." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 27 Feb. 2014.

  • Heisenberg and Schrodinger

    Heisenberg and Schrodinger
    They said that electrons are waves and they orbit around the nucleus. Came up with the most recent model of the atom the electron cloud.
    Methods:
    -used "two-slit experiment" when you send out info. see if info is sent back, if so it is a wave.
    DeWitt, Tyler. "Models of the Atom Timeline." YouTube. YouTube, 06 Dec. 2012. Web. 27 Feb. 2014.
    "Atomic Models." Atomic Models. N.p., n.d. Web. 27 Feb. 2014.