History of the Atom

Timeline created by kacres
  • John Dalton

    John Dalton
    Proposed that all matter was made up of particles and the particles of each element were unique. (more info)
  • J.J. Thomson

    J.J. Thomson
    Came up with the plum pudding or raisin bun model where he said that the atom consists of small negatively charged particles called electrons that were surrounded by a positively charged sphere (more info)
  • Ernest Rutherford

    Ernest Rutherford
    Discovered the nucleus and came up with a model of the atom called the planetary model where you have a positive nucleus at the centre like the sun with electrons orbiting around the nucleus like planets.(more info)
  • Neil Bohr

    Neil Bohr
    • Expanded on Rutherfords model but said that electrons have to stay in specific shells or energy levels. Try this Bohr Activity
  • Erwin Schrodinger

    Erwin Schrodinger
    Used mathematics to explain the location of electrons. He said that electrons did not travel in precise orbits but instead the electrons position was based on probabilities. In certain regions there would be a higher probability of finding an electron than others. This is also called the electron cloud model. (more info)