Tantalum - 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. This video is about tantalum, an element not commonly heard of, but is in everyone's cell phone.
The demand for tantalum has increased with the use of mobile phones, to such an extent that the extraction of tantalum (generally from the mineral coltan) has caused wars in central Africa.