History of an Atom Timeline by Cole Sonnier and Tahj Bailey

By ihatescience
  • 460

    Democritus B.C.

    Democritus B.C.
    democritus discovered this about the atoms everything is composed of "atoms", ehich are physically,but not geometrically ,indivisable and matter could not divided into smaller and smaller pieces forever. Themethod he used was philosophy. He thought the atoms lookedlike small,hard particles.Huffman, Carl A. "Democritus." World Book. World Book Inc., 14 Feb. 2014. Web. 27 Feb. 2014.

  • Dalton

    Dalton
    Discovered that all matter is made of atoms, atoms are indivisilbe and indestructable, all atoms of a given element are identdical in mass and properties, compounds are formed by a combonation of two or more different atoms, a chemical reaction is a rearrangement of atoms, and atoms can be neither created nor destoryed. Usselman, Melvyn C. "Dalton, John." World Book Advanced. World Book, 2014. Web. 27 Feb. 2014.

  • Thomson

    Thomson
    Discovered the electron, electrons are negatively charged, and atoms are mostly positive. Model called Plum Pudding. Stuewer, Roger H. "Thomson, Sir Joseph John." World Book Advanced. World Book, 2014. Web. 27 Feb. 2014.

  • Rutherford

    Rutherford
    First preson to break up the nucleus of an atom through his Gold Foil Experiments. Stuewer, Roger H. "Rutherford, Ernest." World Book Advanced. World Book, 2014. Web. 27 Feb. 2014.

  • Bohr

    Bohr
    Discovered that electrons orbit around the nusleus of an atom. Stanley, Matthew. "Bohr, Niels." World Book Advanced. World Book, 2014. Web. 27 Feb. 2014.

  • Heisenberg and Schrodinger

    Heisenberg and Schrodinger
    Heisenberg described atoms by means of formula connected to the frequencies of spectral lines.Schrodinger propose principle of Indeterminancy.Schrodinger used a mathematical model of the atom,Heisenberg did by means of formula connected to the frequencies of spectral.He viewed electrons continuous clouds. Cassidy, David C. "Heisenberg, Werner." World Book Advanced. World Book, 2014. Web. 6 Mar. 2014., Pesic, Peter. "Schrodinger, Erwin." World Book Advanced. World Book, 2014. Web. 6 Mar. 2014.

  • Aristotle BC

    Dimissed atomic idea as worthless. Thought that all matter is made of four elements: Fire, Water, Earth, Air. Soll, Ivan. "Aristotle." World Book Advanced. World Book, 2014. Web. 27 Feb. 2014.