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Ununseptium - Periodic Table of Videos

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The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Ununseptium is number 117. 

As mentioned in the video, why did the experiments to produce element 117, by bombarding a Berkelium-249 target with Calcium-48 ions, have to be done pretty quickly after the Berkelium target had been made?

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