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Copernicium,  112Cn
General properties
Pronunciation/ˌkpərˈnɪsiəm/ (KOH-pər-NIS-ee-əm)
Mass number285 (most stable isotope)
Copernicium in the periodic table
HydrogenHelium
LithiumBerylliumBoronCarbonNitrogenOxygenFluorineNeon
SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon
PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromineKrypton
RubidiumStrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodineXenon
CaesiumBariumLanthanumCeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercury (element)ThalliumLeadBismuthPoloniumAstatineRadon
FranciumRadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessineOganesson
Hg

Cn

(Uhh)
roentgeniumcoperniciumnihonium
Atomic number (Z)112
Groupgroup 12
Periodperiod 7
Blockd-block
Element category  post-transition metal, alternatively considered a transition metal
Electron configuration[Rn] 5f14 6d10 7s2 (predicted)
Electrons per shell
2, 8, 18, 32, 32, 18, 2 (predicted)
Physical properties
Phase at STPCn: Unknown phase (predicted)
Boiling point357+112
−108
 K ​(84+112
−108
 °C, ​183+202
−194
 °F)
Density when liquid (at m.p.)23.7 g/cm3 (predicted)
Atomic properties
Oxidation states0, (+1), +2, (+4) (parenthesized: prediction)
Ionization energies
  • 1st: 1155 kJ/mol
  • 2nd: 2170 kJ/mol
  • 3rd: 3160 kJ/mol
  • (more) (all estimated)
Atomic radiuscalculated: 147 pm (predicted)
Covalent radius122 pm (predicted)
Other properties
Natural occurrenceCn: Synthetic
Crystal structurebody-centered cubic (bcc)
Body-centered cubic crystal structure for copernicium

(predicted)
CAS Number54084-26-3
History
Namingafter Nicolaus Copernicus
DiscoveryGesellschaft für Schwerionenforschung (1996)
Main isotopes of copernicium
Iso­topeAbun­danceHalf-life (1/2)Decay modePro­duct
277Cnsyn0.69 msα273Ds
281Cnsyn0.18 sα277Ds
282Cnsyn0.91 msSF
283Cnsyn4.2 s90% α9.53, 9.32, 8.94279Ds
10% SF
EC?283Rg
284Cnsyn98 msSF
285Cnsyn28 sα281Ds
286Cnsyn8.45 s ?SF
| references

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.

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 mercuryview more...