Sir James Chadwick

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Chadwick, Sir James,

1891–1974, English physicist, grad. Manchester Univ., 1908. He worked at Manchester under Ernest Rutherford on radioactivity. He was assistant director of radioactive research in the Cavendish Laboratory, Cambridge (1923–35), professor at the Univ. of Liverpool (1935–48), and master of Gonville and Caius College, Cambridge (1948–58). For his discovery of the neutronneutron,
uncharged elementary particle of slightly greater mass than the proton. It was discovered by James Chadwick in 1932. The stable isotopes of all elements except hydrogen and helium contain a number of neutrons equal to or greater than the number of protons.
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 in 1932 he received the 1935 Nobel Prize in Physics. He was knighted in 1945.