hafnium
chemical element with symbol Hf and atomic number 72
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Summary
hafnium is a chemical element[1]. hafnium draws 4,044 Wikipedia views per month (chemical element category, ranking #67 of 144).[2]
Key Facts
- Discoverer or inventor: George de Hevesy[3], Dirk Coster[4]
- Instance of: combustible powder[5], lithophile[6]
- Named after: Copenhagen[7]
- Location of discovery: Denmark[8]
- Canonical SMILES: [Hf][9]
- Element symbol: Hf[10]
- Chemical formula: Hf[11]
- Subclass of: d-block[12]
- Part of: period 6[13], group 4[14], transition metal[15]
- Commons category: Hafnium[16]
- Unicode character: 鉿[17]
- Crystal system: hexagonal crystal system[18]
- Time of discovery or invention: 1922[19]
- Point group: dihexagonal-dipyramidal[20]
- Space group: space group P6₃/mmc[21]
- IPA transcription: ˈhæfniəm[22]
- Topic's main category: Category:Hafnium[23]
- Commons gallery: Hafnium[24]
- Atomic number: 72[25]
- Mohs' hardness: 5.5[26]
- Electronegativity: 1[27]
- Oxidation state: 4[28], -2[29], 0[30], 1[31], 2[32], 3[33]
- Described by source: Armenian Soviet Encyclopedia[34], Great Soviet Encyclopedia (1926–1947)[35]
- Has effect: hafnium exposure[36]
- Has characteristic: paramagnetism[37]
Body
Influence
Things named for hafnium include hafnon[38], a mineral species[39].
Why It Matters
hafnium has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[40] hafnium is known by 60 alternative names across languages and contexts.[41]
Entities named for hafnium include hafnon[38], a mineral species[39].