thorium
chemical element with symbol Th and atomic number 90
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Summary
thorium is a chemical element[1]. thorium draws 7,164 Wikipedia views per month (chemical element category, ranking #53 of 144).[2]
Key Facts
- Discoverer or inventor: Jöns Jacob Berzelius[3]
- Instance of: lithophile[4]
- Named after: Thor[5]
- Canonical SMILES: [Th][6]
- Element symbol: Th[7]
- Chemical formula: Th[8]
- Subclass of: actinide[9], f-block[10]
- Part of: period 7[11], actinide[12]
- Commons category: Thorium[13]
- Unicode character: 釷[14]
- Crystal system: face-centered cubic[15]
- Time of discovery or invention: January 1, 1828[16]
- IPA transcription: ˈθɔːriəm[17]
- Topic's main category: Category:Thorium[18]
- Atomic number: 90[19]
- Mohs' hardness: 3[20]
- Electronegativity: 1[21]
- Oxidation state: 4[22], 3[23], 2[24], 1[25], -1[26]
- Described by source: Armenian Soviet Encyclopedia[27], Brockhaus and Efron Encyclopedic Dictionary[28], Small Brockhaus and Efron Encyclopedic Dictionary[29], Encyclopædia Britannica 11th edition[30]
- Has characteristic: paramagnetism[31]
- Density: 11986.8 kilogram per cubic metre[32]
- Electrical conductivity: 6670000.0 siemens per metre[33]
- Mass: 232.0377 dalton[34]
- Thermal conductivity: 54.0 watt per metre kelvin[35]
- Speed of sound: 2490.0 metre per second[36]
Body
Influence
Things named for thorium include thorite[37], a mineral species[38]; WKW Wilk[39], a weapon model[40], founded in 2000[41]; thorianite[42], a mineral species[43]; and althupite[44], a mineral species[45].
Why It Matters
thorium has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[46] thorium is known by 50 alternative names across languages and contexts.[47]
Entities named for thorium include thorite[37], a mineral species[38]; WKW Wilk[39], a weapon model[40], founded in 2000[41]; thorianite[42], a mineral species[43]; and althupite[44], a mineral species[45].