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mar 8, 1932 - Sir James Chadwick

Description:

In 1932, James Chadwick bombarded beryllium atoms with alpha particles. An unknown radiation was produced. Chadwick interpreted this radiation as being composed of particles with a neutral electrical charge and the approximate mass of a proton. This particle became known as the neutron.

Added to timeline:

Atomic Theory Timeline

ByRachel
11 Oct 2017

Date:

mar 8, 1932
Now
~ 92 years ago
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