The scientists

The scientists

1. In around 600 bc Thales of Miletus discovered that a piece of amber, after rubbing it with fur, attracts bits of hair and feathers and other light objects.

   • In 460 bc a Greek philosopher called Democritus, developod the idea of atoms. He said "If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further?" Democritus thought that it ended at some point, a smallest possible bit of matter. He called these basic matter particles, atoms.
     • John dalton was the main researcher and he came up with most of the units of measuring and other units in the 1800's
       • JJ Thomson discovered the electron in 1897
         • IN 1900 Max Planck, found out that when you vibrate atoms strong enough, such as when you heat an object until it glows
           • In 1905, Albert Einstein wrote a ground-breaking paper that explained that light absorption can release electrons from atoms, a phenomenon called the "photoelectric effect."
             • Ernest rutherford found out that all atoms have a nucleus at the centre in 1911
               • In 1912 Niels Bohr found out that electrons occupy particular orbits or shells around the nucleus of an atom.
                 • Arnold Sommerfeld expanded the original Bohr model to explain these variations. According to the Bohr-Sommerfeld model, not only do electrons travel in certain orbits but the orbits have different shapes and the orbits could tilt in the presence of a magnetic field