Nuclear Physics. 20 th Century Discoveries. Historical Developments. 1895: Roentgen discovered X-rays 1896: Becquerel discovered radioactivity 1897: Thomson discovered electron 1900: Planck “energy is quantized” 1905: Einstein’s theory of relativity 1911: Rutherford discovered the nucleus
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20th Century Discoveries
aluminum, Z = 13, A = 27