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James Chadwick

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by

Min Choi

on 11 February 2014

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Transcript of James Chadwick

The New Atomic Model
The neutron's discovery lead to the current Standard Model Theory of Particle Physics
James Chadwick
-English physicist
-Discovered the neutron in 1932
-Won Nobel Prize 1935
-Advanced our knowledge of the Atomic Model
James Chadwick's Atomic Theory
Chadwick's Discovery
James Chadwick
by Min-Hyung Choi, Nicholas Eickhoff, Justin Norcutt, Erick Vasquez and Corbin Amundson
-He discovered that the atomic number wasn't the same as the atomic mass in a helium nucleus (alpha particle)
-He repeated alpha particle tests to find out
-Actual weight was 4, but with the measurement of the gamma ray he got 2
- the neutron was found weighing 0.1% more than a proton
Chadwick Life
Chadwick studied under Ernest Rutherford and Hans Geiger.
He graduated from the University of Manchester
Atomic Model before Chadwick

Rutherford's New Theory
The new atomic model accounted for the neutron.
Chadwick later went on to work on the atomic bomb
Method of Discovery
Chadwick shot gamma radiation at an alpha particle and was able to measure the amount of radiation ejected. From the radiation ejected he knew that there was another particle.
The atomic model before Chadwick's discovery was an atom with a nucleus full of positively charged particles (protons) and negatively charged particles (electrons) with more electrons surrounding it.
Rutherford theorized that the nucleus could contain neutrally charged particles.

Rutherford and Chadwick came together and worked together on an experiment to prove this.
He named this theoretical particle the
"neutron".
Full transcript