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Atomic Number : 105Atomic symbolisation : DbAtomic Weight : ( 268)Melting tip : UnknownBoiling Point : Unknown
Word Origin : Db is named for Dubna , Russia , plate of the Joint Institute for Nuclear Research , where the component was first report . Some American scientist at the University of California , Berkeley have render to get the constituent to be called “ hahnium ” for the German scientist Otto Hahn . Though the International Union of Pure and Applied Chemistry ( IUPAC ) endorsed the name dubnium , some scientists still refer to the element as “ hahnium . ”
Dubnium
Discovery : In 1967 , scientists in Dubna reported the beingness of element 105 . Their reports were based on finding atoms of some dubnium isotopes using time - concurrence measurement of alpha energies . In late April 1970 , they confirmed their finding by synthesize the element . Around the same time , scientists at the University of California , Berkeley , report that they too had synthesized element 105 . There were also some reports that they had synthesise it in 1969 , and others that the Russians ’ methods of producing the element could not be duplicated with the same results . Credit for the discovery is still controversial .
attribute of atomic number 105
element 105 is a celluloid element about which little is have sex . It is presumed to be a solid metal . [ See periodical Table of the Elements ]
hahnium has seven recognized isotope . The most stable is268Db , which has a half - life history of about 32 hours . It decay through spontaneous fission .
For by nature occurring element , the nuclear weight is calculated from averaging the weights of the raw abundances of the isotope of that element . However , for manmade transuranium element , there is no " natural " copiousness . The IUPAC pattern is to list the nuclear weighting of the longest - lived isotope in the occasional table . These atomic weights should be considered provisional since a unexampled isotope with a longer half - spirit could be produce in the hereafter .
Sources of dubnium
Dubnium is produced artificially and only small amounts have been made . Various isotopes can be made by bombing with the Heavy Ion Linear Accelerator .
Uses of dubnium
Only minor amounts of dubnium have ever been produce and its isotopes have very unretentive half - lives . For this cause , its only use is within scientific research .
( generator : Los Alamos National Laboratory , Jefferson Lab )
