James+Chadwick

James Chadwick Lauren Powell and Monet Green

  ====James Chadwick was born on October 20, 1891 in Chesire, England. Chadwick graduated from the Honors School of Physics in 1911 and 21 years later made a huge discovery. After he graduated he worked under Professor Rutherford in the Physical Laboratory in Manchester where he worked on various radioactive problems. In 1925, he married Aileen Stewart-Brown of Liverpool. They had twin daughters, and lived at Denbigh, North Wales. His hobbies included gardening and fishing.==== James Chadwick proved the existence of neutrons. Chadwick also said that the mass of neutrons and protons were similar. All nuclei contain protons and neutrons, except for the hydrogen which contains protons. "In contrast with the helium nuclei, which are charged, and therefore repelled by the considerable electrical forces present in the nuclei of heavy atoms, this new tool in atomic disintegration need not overcome any electric barrier and is capable of penetrating and splitting the nuclei of even the heaviest elements." []

Here is a copy of Chadwick's model of an atom: (if the picture does not show up correctly, here is the link: []) The contribution James Chadwick made was the discovery of the neutron on 1932. He calculated the mass of the neutral particle. Because of this discovery, Chadwick prepared the way towards the fission of uranium 235. He also helped create a way towards the creation of the atomic bomb.

Chadwick was awarded the Hughes Medal of the Royal Society in 1932 and the Nobel Prize for Physics in 1935.

====Since his discovery, scientist have concluded that neutrons are made up of electrons, protons, and other substances that has no net electric charge. Not many changes have been made, and Chadwick's theory of neutrons has not been proven wrong since he was the most recent scientist to contribute to the atom.====