History of the atom

By lmarble
  • 400 BCE

    Democritus

    Democritus
    All matter has atoms. Atoms are indestructible. Atoms are invisible.

  • John Dalton

    John Dalton
    Elements have tiny particles called atoms. Atoms in the same element have the same mass.

  • Joseph John Thompson

    Joseph John Thompson
    Wrote a books called Treatise on the Motion of Vortex Rings in 1884. Discovered electrons by cathode rays. Created the plum pudding model.

  • Ernest Rutherford

    Ernest Rutherford
    Atoms are in every living thing. Discovered the inner atom.

  • Niels Bohr

    Niels Bohr
    Looked at the structure of atoms.