Atom

History of the Atom

By casildabraga
  • 400 BCE

    Democritus

    Democritus
    Matter is made up of indivisible particles called atoms.
  • Period: 400 BCE to

    Evolution of the atomic model

  • John Dalton

    John Dalton
    The atom was a solid ball that could not be broken down any further.

  • JJ Thomson

    JJ Thomson
    The atom is made up of smaller particles that which are either positively or negatively charged.

  • Ernest Rutherford

    Ernest Rutherford
    Atoms have a nucleus where positive charged protons exist. Electrons revolve around the nucleus.

  • Niels Bohr

    Niels Bohr
    Electrons orbit the nucleus in levels from the nucleus outward.