r/thorium

557 archived posts · Jan 2010 – Jul 2026

Thorium

r/thorium

The Thorium Reddit **Description:** A reddit dedicated to articles and posts relating to thorium. Civil discussions and submissions aren't just welcome they're wanted with intention of farther expanding our understanding of this oft-ignored element.

Created Jan 19, 2010

1.7KMembers (last snapshot)

557Archived posts

The Thorium Reddit

Thorium - a naturally occurring radioactive chemical element with the symbol Th and atomic number 90. It was discovered in 1828 by the Norwegian mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jakob Berzelius and named after Thor, the Norse god of thunder.

Thorium produces a radioactive gas, radon-220, as one of its decay products. Secondary decay products of thorium include radium and actinium. In nature, virtually all thorium is found as thorium-232, which undergoes alpha decay with a half-life of about 14.05 billion years. Other isotopes of thorium are short-lived intermediates in the decay chains of higher elements, and only found in trace amounts. Thorium is estimated to be about three to four times more abundant than uranium in the Earth's crust, and is chiefly refined from monazite sands as a by-product of extracting rare earth metals.

Wikipedia: Thorium

LiveScience: Facts About Thorium

Symbol: Th

Atomic number: 90

Atomic mass: 232.03806 u ± 0.00002 u

Electron configuration: [Rn] 6d27s2

Discovered: 1828 by Jöns Jacob Berzelius

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