Similar Questions for How did James Chadwick Discover The Neutron from Yahoo AnswersQuestionAnswer
See the reference for the experimental setup.
"In 1930 it was discovered that Beryllium, when bombarded by alpha particles, emitted a very energetic stream of radiation. This stream was originally thought to be gamma radiation. However, further investigations into the properties of the radiation revealed contradictory results. Like gamma rays, these rays were extremely penetrating and since they were not deflected upon passing through a magnetic field, neutral. However, unlike gamma rays, these rays did not discharge charged electroscopes (the photoelectric effect). Irene Curie and her husband discovered that when a beam of this radiation hit a substance rich in protons, for example paraffin, protons were knocked loose which could be easily detected by a Geiger counter..........."
Here's a few links to lots of info on Chadwick:
(this one gives insight into Chadwick's thinking, in his own words)
(this one gives detailed info on the actual experiments)
Scientists and their contributions to the study of atoms?Answer
I need a short summary ( 2-3 sentences ) of the scientists contributions to the atom, and the date they discovered it. (year, or broader.)
the scientists are:
Louis De Brogile
And Enrico Fermi. Im trying to get this project done, and have a good 2+ hours of homework in front of me. If anyone could help me out, it would be much appreciated!
democritus - idea of atoms
dalton - plum pudding model
thomson - electron
rutherford - gold foil experiment showed the nucleus is positively charged
bohr - planetary model and energy levels
chadwick - neutron
de broglie - quantum mechanical model
mendeleev - periodic table arranged by atomic masses
fermi - quantum theory and particle physics