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Discovered in 1828 by Swedish scientist Jöns Jacob Berzelius, thorium is a slightly radioactive metal which covers much of the moon. It is an alternative yet to be used other than it’s more expensive counterpart, uranium.

Name: Thorium

Discovered: 1828

Discoverer(s): Jöns Jacob Berzelius, Has Morten Thrane Esmark

Country(s) Discovered: Sweden

Atomic Number: 90

Symbol: Th

Melting Point(C): 1750

Atomic Mass: 232.03806

Group: Actinide

Radioactive? Decay?: Yes, becomes Uranium-233

Normal State: Solid

Metal, nonmetal, metalloid?: Metal

Cost: $10/kg


http://www.webelements.com/thorium/history.html http://en.wikipedia.org/wiki/Thorium

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