History of Atom theory

By Jobiel
  • 460 BCE

    Democritus

    Democritus
    He developed the concept of atoms

  • Dalton

    Dalton
    He created the very first atomic theory. Each element is made up of particles called atoms

  • JJ Thompson

    JJ Thompson
    He showed that the atom was made of most smaller things. Electrons orbiting circles within a sphere of positive charge

  • Ernest Rutherford

    Ernest Rutherford
    He showed that atoms have positive particles in the center and are mostly empty space. He discovered protons and nucleus.

  • Niels bohr

    Niels bohr
    He proposed that electrons move around the nucleus in specific layers layers or shells

  • Erwin Schrodinger

    Erwin Schrodinger
    Described electrons as waves with their probable location viewed as a cloud and introduced a mathematical model of a atom.

  • James Chadwick

    James Chadwick
    Discovered the existence of neutrons, the neutrals particle that shares the nucleus with the positively charged proton.