Its chemistry and appearance are not known with any certainty, although the chemistry is believed to be similar to tantalum. Dubnium has an atomic mass of 262 u. Dubnium is a chemical element discovered by Albert Ghiorso in the year 1970. It is highly radioactive and unstable element. Since Dubnium is not produced in high amounts and it … Dubnium is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 28 hours. Introduction; Discovery Dubnium is a synthetic element that was discovered in 1970. Dubnium does not occur naturally on … Dubnium is harmful due to its radioactivity. Comprehensive data on the chemical element Dubnium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Dubnium. Atomic properties of dubnium. Dubnium is too rare to have any commercial or industrial application. They bombarded atoms of americium-243 with ions of neon-22, forming atoms of dubnium-260 and five free neutrons and atoms of dubnium-261 and four free neutrons. Dubnium was synthesized for the first time by team of scientist working at the Joint Institute for Nuclear Research (JINR), Dubna, Russia in 1968 and later the scientists of American Lawrence Berkeley Laboratory (LBL) announced the discovery of element-105 in 1970. Dubnium was named after the town in the Soviet Union where a team of researchers first synthesized a sample. Feb 19, 2018 - - Dubnium Kitchen - Counter Found in TSR Category 'Sims 4 Counters' History and Discovery. The ground state electronic configuration of neutral dubnium is [Rn].5f 14.6d 3.7s 2 (a guess based upon that of tantalum) and the term symbol of dubnium is 4 F 3/2 (a guess based upon guessed electronic structure).. Dubnium: description Your user agent does not support the HTML5 Audio element. Abundance earth’s crust: nil Dubnium (Db), an artificially produced radioactive transuranium element in Group Vb of the periodic table, atomic number 105. Characteristics: Dubnium is a transactinide or super-heavy element. It is a radioactive synthetic metal and has only been produced in tiny amounts. Periodic Table of Elements Element Dubnium - Db. This greatly limits the extent of research on dubnium. It has never been found naturally and only a small number of atoms have been produced in laboratories. It has an atomic number of 105 with a symbol Db, and it belongs to the 7th period of the 5th group of the periodic table. This greatly limits the extent of research on dubnium. It is a radioactive element, and not found in any naturally occurring states. Skip to page content; Skip to site menu on this page. Dubnium is a highly radioactive metal. As for the position to find dubnium within the periodic table of elements, dubnium is in group 5 and period 7. Dubnium atoms have 105 electrons and the shell structure is 2.8.18.32.32.11.2. Contents. Abundance and Isotopes. Scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, first reported the production of dubnium in 1967. Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. Dubnium is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 28 hours. Uses of Dubnium. Dubnium is an artificial element and was first created and thus found in a laboratory in the city of Dubna. Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. Dubnium is of research interest only. The atomic mass of an element is determined by the total mass of neutrons and protons that can be found in a single atom belonging to this element. The discovery of dubnium (element 105), like that of rutherfordium (element 104), has been a matter of dispute between Soviet and American scientists. 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