HASSIUM

Introdução

Número atômico: 108
Grupo: 8 or VIII B
Peso atômico: 277
Período: 7
Número CAS: 54037-57-9

Classificação

Calcogênio
halogênio
Gás nobre
Lantanóides
Actinóide
Terra-rara
Platinum Metal Group
Transuranium
Não Isótopos Estáveis
Sólido
Líquido
Gás
Sólido (previsto)

Descrição • Usos / Função

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

Propriedades físicas

Densidade:   g/cm3

* - at 1 atm

Configuração Electron

Configuração Electron: [Rn] 7s2 5f14 6d6
Quadra: d
Mais alto nível de energia Ocupado: 7
Elétrons de valência: 

Números quânticos:

n = 6
ℓ = 2
m = -2
ms = -½

Colagem

isótopos

nuclide Massa 2 Meia vida 2 spin nuclear 2 Energia de ligação
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
Os valores marcados # não são puramente derivado a partir de dados experimentais, mas, pelo menos, parcialmente a partir de tendências sistemáticas. Gira com argumentos de atribuição fracos estão entre parênteses. 2

Abundância

Informação de Segurança


Material Safety Data Sheet - ACI Alloys, Inc.

Para maiores informações

Links externos:

Fontes

(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).