COPERNICIUM

introduction

Numéro atomique: 112
Groupe: 12 or II B
Poids atomique: 285
Période: 7
Numero CAS: 54084-26-3

Classification

chalcogènes
Halogène
Gaz rare
lanthanides
actinides
Rare Earth Element
Groupe Platine Métal
Transuranium
Pas d'isotopes stables
Solide
Liquide
Gaz
Solide (prédit)

La description • Usages / Fonction

In late February 1996, Siguard Hofmann and his collaborators at GSI Darmstadt announced their discovery of Element 112, having 112 protons and 165 neutrons, with an atomic mass of 277. This element was made by bombarding a lead target with high-energy zinc ions. A single nucleus of Element 112 was detected, which decayed after less than 0.001 sec by emitting an a particle, consisting of two protons and two neutrons. This created Element 110-273, which in turn decayed by emitting an alpha particle to form a new isotope of Element 108 and so on. Evidence indicates that nuclei with 162 neutrons are held together more strongly than nuclei with a smaller or larger number of neutrons. This suggests a narrow “peninsula” of relatively stable isotopes around Element 114. GSI scientists are experimenting to bombard targets with ions heavier than zinc to produce Elements 113 and 114. A name has not yet been suggested for Element 112, although the IUPAC suggested the temproary name of ununbium when the element was discovered. 1

Propriétés physiques

Densité:   g/cm3

* - at 1 atm

Configuration de l'électron

Configuration de l'électron: [Rn] 7s2 5f14 6d10
Bloque: d
Plus haut niveau d'énergie occupés: 7
Électrons de valence: 

Nombres quantiques:

n = 6
ℓ = 2
m = 2
ms = -½

Bonding

Thermochimie

Chaleur spécifique: 
Conductivité thermique:  (W/m)/K, 27°C 2
Température de fusion: 
Chaleur de vaporisation: 
État de la matière Enthalpie de formation (ΔHf°)3 Entropy (S°)3 Gibbs Free Energy (ΔGf°)3
(kcal/mol) (kJ/mol) (cal/K) (J/K) (kcal/mol) (kJ/mol)
(g) 104.0 435.136 48.41 202.54744 96.8 405.0112

isotopes

Nuclide Masse 4 Demi vie 4 Spin nucléaire 4 Énergie de liaison
277Cn 277.16394(14)# 1.1(7) ms [0.69(+69-24) ms] 3/2+# 1,999.09 MeV
278Cn 278.16431(57)# 10# ms 0+ 2,007.16 MeV
279Cn 279.16655(53)# 0.1# s 2,015.23 MeV
280Cn 280.16704(69)# 1# s 0+ 2,023.30 MeV
281Cn 281.16929(106)# 10# s 3/2+# 2,031.38 MeV
282Cn 282.16977(76)# 30# s 0+ 2,039.45 MeV
283Cn 283.17179(83)# 4.2(2.1) min 2,038.20 MeV
284Cn 284.17238(91)# 31(18) s 0+ 2,046.27 MeV
285Cn 285.17411(78)# 40(30) min 5/2+# 2,054.35 MeV
Les valeurs marquées # ne sont pas purement dérivées des données expérimentales, mais au moins en partie des tendances systématiques. Spins avec de faibles arguments d'affectation sont entre parenthèses. 4

Abondance

Information de sécurité


Fiche signalétique - ACI Alloys, Inc.

Pour plus d'informations

Liens externes:

Sources

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:11.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(3) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(4) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(5) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).