RUTHERFORDIO

Introducción

Número atómico: 104
Grupo: 4 or IV B
Peso atomico: 261
Período: 7
Número CAS: 53850-36-5

Clasificación

chalcogen
halógeno
Gas noble
Lantanoides
Actinoides
Elemento de tierras raras
Platino Metal Group
transuranium
No hay isótopos estables
Sólido
Líquido
Gas
Sólido (Predicho)

Descripción • Usos / Función

In 1964, workers of the Joint Nuclear Research Institute at Dubna (U.S.S.R.) bombarded plutonium with accelerated 113 to 115 MeV neon ions. By measuring fission tracks in a special glass with a microscope, they detected an isotope that decays by spontaneous fission. They suggested that this isotope, which had a half-life of 0.3 ± 0.1 s might be rutherfordium-260, produced by the following reaction. Plutonium-242 collides with neon-22 yielding the daughter rutherfordium-260 and four neutrons. Element 104, the first transactinide element, is expected to have chemical properties similar to those of hafnium. It would, for example, form a relatively volatile compound with chlorine (a tetrachloride). The Soviet scientists have performed experiments aimed at chemical identification, and have attempted to show that the 0.3-s activity is more volatile than that of the relatively nonvolatile actinide trichlorides. This experiment does not fulfill the test of chemically separating the new element from all others, but it provides important evidence for evaluation. New data, reportedly issued by Soviet scientists, have reduced the half-life of the isotope they worked with from 0.3 to 0.15 s. The Dubna scientists suggest the name kurchatovium and symbol Ku for Element 104, in honor of Igor Vasilevich Kurchatov (1903—1960), late Head of Soviet Nuclear Research. The Dubna Group also has proposed the name dubnium for Element 104. In 1969, Ghiorso, Nurmia, Harris, K. A. Y. Eskola, and P. L. Eskola of the University of California at Berkeley reported they had positively identified two, and possibly three, isotopes of Element 104. The group also indicated that after repeated attempts so far they have been unable to produce isotope 260104 reported by the Dubna groups in 1964. The discoveries at Berkeley were made by bombarding a target of californium-249 with carbon-12 nuclei of 71 MeV, and carbon-13 nuclei of 69 MeV. The combination of carbon-12 with californium-249 followed by instant emission of four neutrons produced Element 104-257. This isotope has a half-life of 4 to 5 s, decaying by emitting an alpha particle into nobelium-253, with a half-life of 105 s. The same reaction, except with the emission of three neutrons, was thought to have produced Element 104-258 with a half-life of about 1/100 s. Element 104-259 is formed by the merging of a carbon-13 nuclei with californium-249, followed by emission of three neutrons. This isotope has a half-life of 3 to 4 s, and decays by emitting an alpha particle into nobelium-255, which has a half-life of 185 s. Thousands of atoms of Element 104-257 and Eleemnt 104-259 have been detected. The Berkeley group believe their identification of Element 104-258 was correct. As of January 1995 it was thought that eleven isotopes of Element 104 have been identified. The Berkeley group proposed for the new element the name rutherfordium (symbol Rf), in honor of Ernest Rutherford, New Zealand physicist. This name was formally adapted by IUPAC in 1997. 1

Propiedades físicas

Densidad:   g/cm3

* - at 1 atm

Configuración electronica

Configuración electronica: [Rn] 7s2 5f14 6d2
Bloquear: d
Ocupado más alto nivel de energía: 7
Electrones de valencia: 

Números cuánticos:

n = 6
ℓ = 2
m = -1
ms = +½

Vinculación

potencial de ionización   eV 2  kJ/mol  
potencial de ionización   eV 2  kJ/mol  
potencial de ionización   eV 2  kJ/mol  
1 6    578.9

isótopos

nucleido Masa 3 Media vida 3 spin nuclear 3 Energía de unión
253Rf 253.10069(49)# 13(5) ms (7/2)(+#) 1,867.53 MeV
254Rf 254.10018(31)# 23(3) μs 0+ 1,875.60 MeV
255Rf 255.10134(19)# 1.64(11) s (9/2-)# 1,883.67 MeV
256Rf 256.101166(26) 6.45(14) ms 0+ 1,891.74 MeV
257Rf 257.10299(11)# 4.7(3) s (1/2+) 1,899.81 MeV
258Rf 258.10349(22)# 12(2) ms 0+ 1,907.88 MeV
259Rf 259.10564(8)# 2.8(4) s 7/2+# 1,915.95 MeV
260Rf 260.10644(22)# 21(1) ms 0+ 1,924.03 MeV
261Rf 261.10877(3) 5.5(25) s 3/2+# 1,932.10 MeV
262Rf 262.10993(30)# 2.3(4) s 0+ 1,940.17 MeV
263Rf 263.11255(20)# 11(3) min 3/2+# 1,938.93 MeV
264Rf 264.11399(48)# 1# h 0+ 1,947.00 MeV
265Rf 265.11670(46)# 13 h 3/2+# 1,955.07 MeV
266Rf 266.11796(58)# 10# h 0+ 1,963.14 MeV
267Rf 267.12153(62)# 5# h [2.3(+980-17) h] 1,961.90 MeV
268Rf 268.12364(76)# 1# h 0+ 1,969.97 MeV
Los valores marcados con # no son puramente derivan de los datos experimentales, pero al menos en parte, de las tendencias sistemáticas. Hace girar con débiles argumentos de asignación se incluyen entre paréntesis. 3

Abundancia

Información de seguridad


Ficha de datos de seguridad de materiales - ACI Alloys, Inc.

Para más información

Enlaces externos:

Fuentes

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:27.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 10:178 - 10:180.
(3) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:193, 12:219-220.
(4) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(5) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(6) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).