neptunium
chemical element with symbol Np and atomic number 93
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Summary
neptunium is a chemical element[1]. neptunium draws 3,312 Wikipedia views per month (chemical element category, ranking #81 of 144).[2]
Key Facts
- Discoverer or inventor: Edwin McMillan[3], Philip Abelson[4]
- Named after: Neptune[5]
- Canonical SMILES: [Np][6]
- Element symbol: Np[7]
- Chemical formula: Np[8]
- Subclass of: actinide[9], heavy metal[10], f-block[11]
- Part of: period 7[12], actinide[13]
- Commons category: Neptunium[14]
- Unicode character: 錼[15]
- Crystal system: orthorhombic crystal system[16]
- Time of discovery or invention: January 1, 1940[17]
- IPA transcription: nɛpˈtjuːniəm[18]
- Topic's main category: Category:Neptunium[19]
- Commons gallery: Neptunium[20]
- Atomic number: 93[21]
- Electronegativity: 1.36[22]
- Oxidation state: 2[23], 3[24], 4[25], 5[26], 6[27], 7[28]
- Described by source: Armenian Soviet Encyclopedia[29]
- Has characteristic: paramagnetism[30]
- Different from: Neptun[31]
- Density: 21731.7 kilogram per cubic metre[32]
- Electrical conductivity: 820000.0 siemens per metre[33]
- Mass: 237.0481736 dalton[34]
- Thermal conductivity: 6.3 watt per metre kelvin[35]
- Melting point: 913.0 K[36]
Why It Matters
neptunium has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[37] neptunium is known by 47 alternative names across languages and contexts.[38]