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jan 1, 1906 - 1906 - Discovery of "radioactinium" Hahn discovers "radioactinium", which is now known as actinium-x, an isotope of actinium. This discovery was made while working alongside Ernest Rutherford, the leading chemist at the time.
Added to timeline:
12 Nov 2019
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Otto Hahn
Date:
jan 1, 1906
Now
~ 118 years ago