For four years, James Chadwick ... the lab. Chadwick's own research focused on radioactivity. In 1919 Rutherford had discovered the proton, a positively charged particle within the atom's nucleus.
In 1913, Niels Bohr revised Rutherford's model by suggesting that the electrons ... It wasn't until 1932 that James Chadwick was able to prove its existence. Chadwick used a version of ...
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