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jan 9, 1932 - James Chadwick 1932 Chadwick discovered the neutron 1932. seem to be the only particle in the nucleus. atom). For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2.
Added to timeline:
10 Feb 2018
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Science Periodic Table
Date:
jan 9, 1932
Now
~ 92 years ago