History of Atom

By Koty.miles
  • 101

    Democritus - 429 B.C.

    First person to think that all matter is made of atoms
  • 101

    Aristotle - 400 B.C.

    Believed that everything was made of the four elements

  • Sir Issac Newton

    Also believed that all mattrer was made of atoms.

  • Dalton

    1. Atoms cannot be destroyed (F)
    2. Compounds are made of atoms (F)
    3. All atoms of the same element are identical (T)
    4. Different elements have different types of atoms (T)

  • J.J. Thompson

    Proved existence of electrons

  • Henri Bacquerel

    Discovered radioactivity

  • Robert Andrews Millikan

    Mass of electron at least 10,000X smaller than smallest atom.

  • Rutherford

    Found nucleus and proton

  • Bohr

    Electrons travel in orbits around nucleus

  • Francis Aston

    Discovered isotopes