Famous Dead Guy Timeline- Loryn

  • 101

    Democritus - 429 BC

    First person to think of the atom.
    Thought the atom was a solid circle.
  • Issac Newton

    Tiny pieces of mass "swimming" everywhere
    *(he agreed with Democritus)*
  • John Dalton

    All matter is composed of atoms - true
    Atoms cannot be made or destoryed - false; an atom can be split
    by a nuclear reaction
    All atoms of the same elements are idenctical - false; isotopes
    Different elements have different types of atoms - true
    Chemcial reactions occure when atoms are rearranged - true
    Compunds are formed from atoms of different elements - true
  • Henri Becquerel

    Helped discover radioactivity
  • J.J Thomson

    Proved the existence of negatively charged atoms ( electrons )
  • Andrew Milikan

    Measured charge and mass of electron.
  • Rutherford

    An atom has a central positive nucleus surrounded by negative orbiting elements.
    He was credited with the nucleus and proton.
  • Bohr

    His electrons are traveling in orbits.
    Decided atom was a small, positively charged nucleus surrounded by electrons.
  • Francis Aston

    Discovered isotopes of non-radioactive elements.
  • Schrodinger

    Found the atom consist of nucleus aned cloud.
    Discovered the formula that calculated the odds of where the electron might be.
    Proved Bohr's model incorrect.
  • James Chadwick

    Discovered the nuetron.
  • Aristotle - 400 BC

    Thought everything was made up of fire, air, earth, and water instead of atoms