Democritus

By haleylanders
  • 101

    Democritus

    Democritus
    • he believed all matter consisted of extremely small particles that could not be divided. Also known as atoms. He thought that there were different types of atoms with specific set of proerties.
    • He believed liquids were round and smooth, but solids were rough and prickly.

  • John Dalton

    John Dalton
    • He thinks the atoms are tiny, indestructible particles, with no internal structure.
    • Dalton's proposed theory that all matter is made up of individual particles called atoms, which cannot be divided.

  • J.J. Thomson

    J.J. Thomson
    • Thomson used a sealed tube of gas in his experiment. When the curent was on, the disks became charged and a glowing beam appeared in the tube. The beam bent toward a positiveky charged plate placed outside the tube.
    • provided the first evidence that atoms are made of even smaller particles.
    • "chocolate chip ice cream" negative charges balance out positive charges.

  • Ernest Rutherford

    Ernest Rutherford
    • Path of an alpha particle can be detected by the location of a flash on a screen. He expected the paths to be positive and that aimed at thin gold foil to be affected only slightly by gold atoms. More particles were deflected than expected and some particles would bounce back.
    • All positive charged atoms are concentrated into the nucleus.
    • a circle, with particles that go through a "slit" and some go into nucleus while others bounce off the wall.

  • Hantaro Nagoka

    Hantaro Nagoka
    • based around an alalogy to the explanation of the stability of the Saturn rings.
    • Saturn planet.

  • Neils Bohr

    Neils Bohr
    • the electrons move in spherical orbits at fixed distances from the nucleus. The electrons move in constant speed in fixed orbits around the nucleus. Each electron in an atom has a specific amount of energy. The energy can also change. An electron in an atom can move from one energy level to another when the atom gains or loses energy.
    • cirlces around the nucleus, with electrons around.

  • Werner Heisenberg & Erwin Schrodinger

    Werner Heisenberg & Erwin Schrodinger
    • mathematical equations to describe the motion of electrons in the atoms. Lead to the electron cloud.
    • a nucleus with protrons and nuetrons with a electron cloud around it.

  • James Chadwick

    James Chadwick
    • He designed an experiment to show that nuetrons exist. He concluded that particles that were produced were neutral because of the charged object not being deflected in the path.
    • All protons and nuetrons grouped together in the nucleus, while electrons surround in the cloud.