Atomic Model : Sarah Ganger

Timeline created by sganger
  • Oct 28, 1000

    Democritus

    Democritus
    What
    He thought that all matter consisted of extremly small particles that cannot be divided.
    How
    He thought his ideas out with Aristotle in 500 BC
  • Oct 28, 1000

    Aristotle

    Aristotle
    What
    He had the idea of a structure of matter
    How
    He thought his ideas out with Democritus in 500BC.
  • Issac Newton

    Issac Newton
    What
    Proposed a mechanical universe with small solid masses in motion
  • John Dalton

    John Dalton
    What
    All matter consisted of extremely small particels that cannot be divided
    How
    Dalton measured the mass of elements that combine when compounds form
  • Dmitri Mendeleev

    Dmitri Mendeleev
    What
    Arranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic functions of the their atomic weights". This became known as the Periodic Law
  • Joseph John Thomson

    Joseph John Thomson
    What:
    Thomsond thought that things with opposite attractions attrack each other.
    How:
    his experiment had one disk a each end of a tube. Wires connected each disk to a source of electric currents. When the current is turned on, one disk becomes negative charged ,and the other becomes positively charged. Aglowing space appears between the disk.
  • Ernest Rutherford

    Ernest Rutherford
    What
    He believed that uranium enits have fast- moving particels that have a positive charge.
    How
    He had an atom with an evenly spaced mass with positive charges.
  • Hantaro Nagaoka

    Hantaro Nagaoka
    What:
    He suggested that an atom has a central nucleus.
    How
    He had an image that electrons move in orbit like the rings around Satur
  • Erwin Schrodinger

    Erwin Schrodinger
    What:
    He developed mathmatics equations to describe the motion of electrons in atoms.
    His work lead to the electrron cloud model.
  • James Chadwick

    James Chadwick
    What
    He confirms the existences of neutrons, which have no charge.
    How
    Atomic nuclie contained neutrons and psitively charged protons.
  • Louis de Broglie

    Louis de Broglie
    What:
    Louis proposed that moving particels like electrons have some properties of waves.
  • Niels Bohr

    Niels Bohr
    What
    He thought that his idea and Rutherfords were the same, but his had a nuclrus surrounded by a large volume of space.
    How
    Bohrs modle focoused on the electrons movement with constant speed with a fixed odit around the nucleus.