Polonium - Tales from the Periodic Table
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The Origin of the Elements
49:20
Radium - Tales from the Periodic Table
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Francium - Tales from the Periodic Table
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Are there Undiscovered Elements Beyond The Periodic Table?
53:46
Particles Unknown: Hunting Neutrinos | Full Documentary | NOVA | PBS
16:17
How Do Elements Get Their Physical Properties - Simple Explanation | Arvin Ash
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Incredibly rare and radioactive elements ☢
33:54