Copernicium
Copernicium (formerly Ununbium) is a chemical element in the Periodic Table. It is also named eka-mercury. It has the symbol Cn. It has the atomic number 112. It is a transuranium element.
| Copernicium | ||||||||||||||||||||||||||||||
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| Pronunciation | /ˌkoʊpərˈnɪsiəm/ | |||||||||||||||||||||||||||||
| Mass number | [285] | |||||||||||||||||||||||||||||
| Copernicium in the periodic table | ||||||||||||||||||||||||||||||
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| Group | group 12 | |||||||||||||||||||||||||||||
| Period | period 7 | |||||||||||||||||||||||||||||
| Block | d-block | |||||||||||||||||||||||||||||
| Electron configuration | [Rn] 5f14 6d10 7s2 (predicted)[1] (predicted) | |||||||||||||||||||||||||||||
| Electrons per shell | 2, 8, 18, 32, 32, 18, 2 (predicted) | |||||||||||||||||||||||||||||
| Physical properties | ||||||||||||||||||||||||||||||
| Phase at STP | gas (predicted) | |||||||||||||||||||||||||||||
| Boiling point | 357+112 −108 K (84+112 −108 °C, 183+202 −194 °F)[2] | |||||||||||||||||||||||||||||
| Density when liquid (at m.p.) | 23.7 g/cm3 (predicted)[1] | |||||||||||||||||||||||||||||
| Atomic properties | ||||||||||||||||||||||||||||||
| Oxidation states | 0, (+1), +2, (+4), (+6) (parenthesized: prediction)[1][3][4][5] | |||||||||||||||||||||||||||||
| Ionization energies |
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| Atomic radius | calculated: 147 pm[1][6] (predicted) | |||||||||||||||||||||||||||||
| Covalent radius | 122 pm (predicted)[7] | |||||||||||||||||||||||||||||
| Other properties | ||||||||||||||||||||||||||||||
| Natural occurrence | synthetic | |||||||||||||||||||||||||||||
| Crystal structure | body-centered cubic (bcc) (predicted)[8] | |||||||||||||||||||||||||||||
| CAS Number | 54084-26-3 | |||||||||||||||||||||||||||||
| History | ||||||||||||||||||||||||||||||
| Naming | after Nicolaus Copernicus | |||||||||||||||||||||||||||||
| Discovery | Gesellschaft für Schwerionenforschung (1996) | |||||||||||||||||||||||||||||
| Isotopes of copernicium | ||||||||||||||||||||||||||||||
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The element is named in honor of Nicolaus Copernicus.
Using periodic trends, people think that it will be a liquid metal. It is likely to be more volatile than mercury.
History
Copernicium was first made on February 9, 1996 at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany. Copernicium was made by nuclear fusion of a zinc atom with a lead atom. The zinc nuclei was bombarded on to a lead target in a machine named a heavy ion accelerator.
The element was made in 2000 and 2004 at the Joint Institute for Nuclear Research in Russia.
In May 2006 in the Joint Institute for Nuclear Research checked that it had been made using a different method. They identified the last atoms that were made from radioactive decay of copernicium.
In February 2010 IUPAC officially approved the name copernicium and symbol Cn.[14]
References
Other websites
- WebElements.com - Copernicium
- Apsidium - Copernicium Archived 2007-04-04 at the Wayback Machine
- Indication for a gaseous element 112 Archived 2007-03-29 at the Wayback Machine
- Element 112 is Named Copernicium Archived 2010-02-24 at the Wayback Machine
