Atomic theory scientist project

By JonasM32
  • 460

    Democritus 460 B.C.

    Democritus 460 B.C.
    -He said that the universe was made up of empty space.
    - He said the univere was made up of tine bits of stuff. (this is called atomos)
    - Atomos is greek and translates to cannot be divide or uncuttable
    - Democritus said atoms cannot be divide.
    - In his experiment he cut up bread. He discovered that once it gets small enough it can't be cut anymore.
  • Period: 460 to

    Timeline of Atomic Model

  • John Dalton early 1800s

    • John Dalton was an englishman who lived in the United Kingdom. He made contributions to the understanding of atomic theory.
    • He was born on September 6, 1766 in Eaglesfield, UK and died on July 26, 1844 in Manchester, UK.
    • He and his brother were both color-blind. Dalton also make contributions (first) to study co
    • He said all elements are made up of Atoms.
    • All atoms of the same element are alike
    • All atoms of different elements are different.
    • Elements combine in specific proportions.

  • JJ Thomson 1898

    • He dicovered that electrons have negative charges
    • He believed that atoms are postive with the same # of electrons

  • Ernest Rutherford 1911

    • He discovered that atoms are mostly empty space.
    • He discovered that there is a small positively charged nucleus in the middle of the atom.
    • He discovered that negativiley charged electrons scattered on the outside.
    • The nucleus contains Protons

  • Neils Bohr

    Neils Bohr
    • He discovered that electrons orbit around the nucleus.
    • He believed that the electrons moved around th nucleus in a definite path.(Similiar to solar system)
    • He discovered that electrons can jump orbital levels.
    • He stated energy levels hold electrons.
    - He discovered that atoms were made up of protons(+), neutrons(+/- or N), and electrons(-)

  • Modern Electron Cloud ( Erwin Schrodinger and Werner Heisenberg) 1927

    • This states that nucleus contains Protons and Neutrons.
    • Electrons move around the nucleus.
    • It is a 3-D model
    • testing