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mar 10, 1934 - James chadwick

Description:

Until 1932, the atom was believed to be composed of a positively charged nucleus surrounded by negatively charged electrons. In 1932, James Chadwick bombarded beryllium atoms with alpha particles. An unknown radiation was produced. ... This particle became known as the neutron.

Added to timeline:

8 months ago
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Atomic model timeline

Date:

mar 10, 1934
Now
~ 84 years ago
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