Chemistry Timeline
James Chadwick 1891-1974 AD
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Democritus 460bc- 370BC
Aristotle 384-323 BC
Dalton 1766 - 1844 AD
J.J. Thomson 1856 - 1940AD
Robert Millikan 1868-1953AD
Ernest Rutherford 1871-1937 AD
Niels Bohr 1885-1962 AD
Erwin Schrödinger 1887-1961 AD
Werner Heisenberg 1901 - 1976 AD
James Chadwick 1891-1974 AD
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In 1932 Chadwick proved the existence of neutrons. He used a different method for tracking particle radiation and knocked the protons out of the nucleus. But the nucleus still had some mass, what proved that neutrons exist.

In 1932 Adolf Hitler obtains German citizenship by naturalization, opening the opportunity for him to run in the 1932 election for Reichspräsident.