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Radioactive Elements Found in Nature

There are many radioactive elements, but only nine were found in nature, not in a labratory. Can you name those nine?
Quiz by cosmokim
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Last updated: December 6, 2016
First submittedDecember 6, 2016
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Element
Polonium
Astatine
Radon
Francium
Radium
Element
Actinium
Thorium
Protactinium
Uranium
+1
level 60
Dec 6, 2016
I got more than I thought I would. :)