actinium
chemical element with symbol Ac and atomic number 89
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Summary
actinium is a chemical element[1]. actinium draws 3,147 Wikipedia views per month (chemical element category, ranking #99 of 144).[2]
Key Facts
- Discoverer or inventor: André-Louis Debierne[3]
- Instance of: radioactive element[4]
- Named after: light beam[5]
- Canonical SMILES: [Ac][6]
- Element symbol: Ac[7]
- Chemical formula: Ac[8]
- Subclass of: heavy metal[9], f-block[10]
- Part of: group 3[11], period 7[12], actinide[13]
- Commons category: Actinium[14]
- Unicode character: 錒[15]
- Crystal system: face-centered cubic[16]
- Time of discovery or invention: 1899[17]
- Point group: cubic-hexoctahedral[18]
- Space group: space group Fm-3m[19]
- IPA transcription: ækˈtɪniəm[20]
- Topic's main category: Category:Actinium[21]
- Commons gallery: Actinium[22]
- Atomic number: 89[23]
- Electronegativity: 1.1[24]
- Oxidation state: 3[25]
- Described by source: Great Soviet Encyclopedia (1926–1947)[26], Brockhaus and Efron Encyclopedic Dictionary[27], Small Brockhaus and Efron Encyclopedic Dictionary[28], Granat Encyclopedic Dictionary[29], Armenian Soviet Encyclopedia, vol. 1[30]
- Has characteristic: radioactivity[31]
- Density: 10070.0 kilogram per cubic metre[32]
- Mass: 227.028 dalton[33]
- Thermal conductivity: 12.0 watt per metre kelvin[34]
Body
Influence
Things named for actinium include actinide[35], a chemical series[36] and protactinium[37], a chemical element[38].
Why It Matters
actinium has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[39] actinium is known by 41 alternative names across languages and contexts.[40]
Entities named for actinium include actinide[35], a chemical series[36] and protactinium[37], a chemical element[38].