Dubnium Db, element

For element 104 the names Kurchatovium (Ku) and Rutherfordium (Rf) were proposed by the groups at Dubna and Berkeley, respectively, thereby emphasizing their claim to the discoveries. The International Union on Pure and Applied Chemistry (lUPAC) has now decided on the following names element 104 Rutherfordium (Rf), element 105 Dubnium (Db), element 106 Seaborgium (Sg), element 107 Bohrium (Bh), element 108 Hassium (Hs), and element 109 Meitnerium (Mt). In the Periodic Table and nuclide charts we have thus used io4Rf. 106 8 107 > 108 So far no names have been... 

Abstract In this chapter, the chemical properties of the man-made transactinide elements rutherfordium, Rf (element 104), dubnium, Db (element 105), seaborgium, Sg (element 106), bohrium, Bh (element 107), hassium, Hs (element 108), and copernicium, Cn (element 112) are reviewed, and prospects for chemical characterizations of even heavier elements are discussed. The experimental methods to perform rapid chemical separations on the time scale of seconds are presented and comments are given on the special situation with the transactmides where chemistry has to be studied with single atoms. It follows a description of theoretical predictions and selected experimental results on the chemistry of elements 104 through 108, and element 112. 

At this time, to name an element a researcher or team of researchers must be certified by lUPAC as the discoverers of that element, at which time they are free to name the compound. The elements 104-109 were subject to a naming controversy. The originally proposed names of these elements by lUPAC were, in order, dub-nium, joliotium, rutherfordium, bohrium, hahnium, and meiterium. The names which appear on the current periodic table are, in order, rutherfordium (Rf), dubnium (Db), seaborgium, bohrium (Bh), hassium (Hs), and meitnerium (Mt). 

Results of these experiments provided strong evidence that elements 104, ruther-fordium (Rf), 105, dubnium (Db), 106, seaborgium (Sg) and, very recently, element 107, bohrium (Bh) (Eichler et al 2000) behave similarly to their lighter homologues... 

Elements 104, 105, and 106 have been named rutherfordium (Rf), dubnium (Db), and seaborgium (Sg), respectively. These elements are synthesized from californium-249 by bombarding with carbon-12, nitrogen-15, and oxygen-18 nuclei, respectively. Four neutrons are formed in each reaction as well. Write balanced nuclear equations for the formation of these elements. 

In 1967, the JINR reported creation of a few atoms of element 105 with mass 261 and a lifetime of 1.8 seconds and reported other isotopes three years later. In 1970, the Berkeley group synthesized element 105 with mass 260 and tj/2 of 1.52 seconds but could not reproduce the 1967 Russian data. While the Berkeley group promoted hahnium as the name for element 105, lUPAC adopted the name dubnium (Db) in 1977. The most stable isotope (discovered in 2004 in Dubna) is ty 16 hours. 

When a scientist discovered a new element in the early days of chemistiy, he or she had the honor of naming it. Now researchers must submit their choices for a name to an international committee called the International Union of Pure and Applied Chemistry before they can be placed on the periodic table. In 1997, the lUPAC decided on names for the elements from 104 through 111. These eight elements are now called rutherfordium (Rf), dubnium (Db), sea-borgium (Sg), bohrium (Bh), hassium... 

Element 105 Dubnium (Db) named after Dubna, its piace of discovery (LBNL Berkeiey, JiNR Dubna, shared). 

Abstract An overview over the chemical separation and characterization experiments of the four transactinide elements so far studied in liquid phases, rutherfordium (Rf), dubnium (Db), seaborgium (Sg), and hassium (Hs), is presented. Results are discussed in view of the position of these elements in the Periodic Table and of their relation to theoretical predictions. Short introductions on experimental techniques in liquid-phase chemistry, specifically automated rapid chemical separation systems, are also given. Studies of nuclear properties of transactinide nuclei by chemical isolation will be mentioned. Some perspectives for further liquid-phase chemistry on heavier elements are briefly discussed. 

Dubnium - the atomic number is 105 and the chemical symbol is Db. The name derives from the location of the Russian research center, the Joint Institute for Nuclear Research lab in Dubna , Russia. The first synthesis of this element is jointly credited to the American scientific team at the University of California in Berkeley, California imder Albert Ghiorso and the Russian scientific team at the JINR (Joint Institute for Nuclear Reactions) lab in Dubna, Russia, imder Georgi N. Flerov in 1970. The longest half-life associated with this unstable element is 34 second Db. 

After evidence of the formation of unnilpentium in 1970 by the Berkeley team, the American Chemical Society (ACS) changed the name Unp to hahnium. To settle the confusing claims, the lUPAC recommended that scientists from the Russian and Berkeley groups get together to review and confirm conflicting data. This cooperative venture was never implemented. In 1997 the lUPAC decided to change the name hahnium (j Ha) to dubnium ( jj Db) after the location of the Russian nuclear research lab that first produced the new element. Dubnium is the name by which it is known by today. 

Dubnium — (named after the Joint Institute of Nuclear Research in Dubna, Russia). Db at. wt. [262] at. no. 105. In 1967 G. N. Flerov reported that a Soviet team working at the Joint Institute for Nuclear Research at Dubna may have produced a few atoms of "105 and " 105 by bombarding Am with Ne. Their evidence was based on time-coincidence measurements of alpha energies. More recently, it was reported that early in 1970 Dubna scientists synthesized Element 105 and that by the end of April 1970 had investigated all the types of decay of the new element and had determined its chemical properties. In late April 1970, it was announced that Ghiorso, Nurmia, Harris, K. A. Y. Eskola, and P. L. Eskola, working at the University of California at Berkeley, had positively identi-... 

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