astatine
chemical element with symbol At and atomic number 85
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Summary
astatine is a chemical element[1]. astatine draws 9,087 Wikipedia views per month (chemical element category, ranking #58 of 144).[2]
Key Facts
- Discoverer or inventor: Emilio G. Segrè[3]
- Instance of: synthetic element[4]
- Named after: instability[5]
- Location of discovery: United States[6]
- Canonical SMILES: [At][7]
- Element symbol: At[8]
- Chemical formula: At[9]
- Subclass of: metalloid[10], halogens[11], p-block[12]
- Part of: period 6[13], halogens[14]
- Commons category: Astatine[15]
- Unicode character: 砈[16]
- Crystal system: face-centered cubic[17]
- Time of discovery or invention: 1940[18]
- IPA transcription: ˈæstətiːn[19], ˈæstətɪn[20]
- Topic's main category: Category:Astatine[21]
- Commons gallery: Astatine[22]
- Atomic number: 85[23]
- Electronegativity: 2.2[24]
- Oxidation state: -1[25], 1[26], 3[27], 5[28], 7[29]
- Described by source: Armenian Soviet Encyclopedia, vol. 1[30]
- Mass: 209.9871479 dalton[31]
- Thermal conductivity: 2.0 watt per metre kelvin[32]
- Melting point: 575.0 K[33]
- Boiling point: 503 K[34]
- Ionization energy: 9.31751 electronvolt[35]
Why It Matters
astatine has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[36] astatine is known by 52 alternative names across languages and contexts.[37]