HASSIUM

introduction

Numéro atomique: 108
Groupe: 8 or VIII B
Poids atomique: 277
Période: 7
Numero CAS: 54037-57-9

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

This element was first synthesized and identified in 1984 by the same G.S.I. Darmstadt group who first identified Elements 107 and 109. Presumably this element will have chemical properties similar to osmium. Isotope 265108 was produced using a beam of 58Fe projectiles, produced by the Universal Linear Accelerator (UNILAC) to bombard a 208Pb target. Discovery of Elements 107 and 109 was made using detection of isotopes with odd proton and neutron numbers. Elements having even atomic numbers are thought to be less stable against spontaneous fusion than odd elements. The production of 265108 in the same reaction as was used at G.S.I. was confirmed at Dubna with detection of the 7th member of the decay chain 253Es. Isotopes of Element 108 were believed to decay by spontaneous fission, explaining why 109 was produced before 108. Isotope 265108 and 266108 are thought to decay to 261106, which in turn decays to 257104 and 253No. The IUPAC adopted the name hassium, after the German state of Hesse, in 1997. 1

Propriétés physiques

Densité:   g/cm3

* - at 1 atm

Configuration de l'électron

Configuration de l'électron: [Rn] 7s2 5f14 6d6
Bloque: d
Plus haut niveau d'énergie occupés: 7
Électrons de valence: 

Nombres quantiques:

n = 6
ℓ = 2
m = -2
ms = -½

Bonding

isotopes

Nuclide Masse 2 Demi vie 2 Spin nucléaire 2 Énergie de liaison
263Hs 263.12856(37)# 1# ms 7/2+# 1,926.48 MeV
264Hs 264.12839(5) 540(300) μs 0+ 1,934.55 MeV
265Hs 265.13009(15)# 2.1(3) ms [2.0(+3-2) ms] 9/2+# 1,933.31 MeV
266Hs 266.13010(31)# 2.7(10) ms [2.3(+13-6) ms] 0+ 1,941.38 MeV
267Hs 267.13179(11)# 32(15) ms 3/2+# 1,949.45 MeV
268Hs 268.13216(44)# 2# s 0+ 1,957.52 MeV
269Hs 269.13406(13)# 27(17) s 1,965.59 MeV
270Hs 270.13465(31)# 3.6(+8-14) s 0+ 1,973.66 MeV
271Hs 271.13766(36)# 40# s 1,981.74 MeV
272Hs 272.13905(62)# 40# s 0+ 1,989.81 MeV
273Hs 273.14199(89)# 50# s (3/2+)# 1,988.56 MeV
274Hs 274.14313(70)# 1# min 0+ 1,996.64 MeV
275Hs 275.14595(77)# 0.15(+27-6) s 2,004.71 MeV
276Hs 276.14721(89)# 1# h 0+ 2,012.78 MeV
277Hs 277.14984(78)# 40(30) min 3/2+# 2,020.85 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. 2

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 4:14.
(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) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).