Protactinium (new) - Periodic Table of Videos

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Here's a new video about Protactinium, number 91 on the periodic table!
Videos on all 118 elements: http://bit.ly/118elements

Eric Scerri's book (UK): http://bit.ly/SevenScerriUK
And (US): http://bit.ly/SevenScerriUS

(*)
Isotope 238 has half life 6.8 hrs
Isotope 238m has half life 1.17 mins

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