1. By: Jose Tapay & Gurleen Dhaliwal James Chadwick

2. Biography Born in England in 1891 Died July 24 1974 Attended Manchester University in 1908 Graduated from the Honours School of Physics in 1911 Chadwick's research focused on radioactivity Enrolled in Ernest Rutherford’s classes on electricity and magnetism

3. Idea of the Atom In 1932- discovered a third type of subatomic particle, which Chadwick named the neutron Neutrons… Stabilize the protons in the atom's nucleus. Help to reduce the repulsion between protons Do not have any electrical charge

4. Experiments Existence of the Neutron: Smashed an alpha particle into beryllium releasing radiation into paraffin wax. Beryllium radiation hit the hydrogen atoms Discovered neutral particles (neutrons)

5. Major Scientific Contribution The neutron enabled scientists to produce new elements It also led to the discovery of nuclear fission Helped to make the atomic bomb during WW11 Nobel Prize in 1935.

6. Bibliography http://www.nobelprize.org/nobel_prizes/physics/laureates/193 5/chadwick-bio.html http://www.nobelprize.org/nobel_prizes/physics/laureates/193 5/chadwick-bio.html http://www.ehow.com/info_8047231_experiments-did-james- chadwick-do.html http://www.ehow.com/info_8047231_experiments-did-james- chadwick-do.html http://hyperphysics.phyastr.gsu.edu/hbase/particles/neutrondis. html http://hyperphysics.phyastr.gsu.edu/hbase/particles/neutrondis. html http://www.ehow.com/info_8099568_interesting-james- chadwick.html http://www.ehow.com/info_8099568_interesting-james- chadwick.html