Rutherfordium
Small amounts of rutherfordium have been produced by bombarding plutonium-242 with accelerated neon-22 or californium-249 with accelerated carbon-12 ions in the 1960s. The priority of the discovery and therefore the naming of the element was disputed between Russian and American scientists
Isotopes of rutherfordium
at GSI first studied this reaction in 1994 in an effort to study neutron deficient isotopes of rutherfordium . They were able to detect 255 Rf and 144 atoms of the new isotope 254 Rf, which decayed by spontaneous fission . [ 3 ] 204 Pb( 50 Ti,xn) 254−x Rf (x=1) The team at GSI first studied
Dubnium
This is a radioactive synthetic element whose most stable isotope is 268 Db with a half life of 28 hours. [ 1 ] This is the longest lived transactinide isotope and is a reflection of the stability of the Z = 108 and N = 162 closed shells and the effect of odd particles in nuclear
Seaborgium
Seaborgium is a synthetic element whose most stable isotope 271 Sg has a half-life of 1.9 minutes . Chemistry experiments with seaborgium have firmly placed it in group 6 as a heavier homologue to tungsten . Contents 1 Discovery 2 Proposed names 3 Extrapolated chemical properties
Hassium
Hassium was first synthesized in 1984 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt . The team bombarded a lead target with 58 Fe nuclei to produce 3 atoms of 265
Bohrium
It is a synthetic element whose most stable known isotope , 270 Bh, has a half-life of 61 seconds . Chemical experiments have confirmed bohrium's predicted position as a heavier homologue to rhenium with the formation of a stable +7 oxidation state . [ 1 ] Contents 1 History 1
Darmstadtium
Darmstadtium was first created on November 9, 1994 at the Gesellschaft für Schwerionenforschung (GSI) in Wixhausen , a northern suburb of Darmstadt , Germany by Peter Armbruster and Gottfried Münzenberg , under the direction of professor Sigurd Hofmann. Four atoms of it were detected
Ununquadium
About 80 decays of atoms of ununquadium have been observed to date, 50 directly and 30 from the decay of the heavier elements ununhexium and ununoctium . All decays have been assigned to the four neighbouring isotopes with mass numbers 286-289. The longest-lived isotope currently known is
Copernicium
Copernicium is currently the highest-numbered element to be officially recognised by the International Union of Pure and Applied Chemistry (IUPAC). The most stable isotope discovered to date is 285 Cn with a half-life of ≈30 s, although evidence exists that 285 Cn may have a nuclear isomer
Ununhexium
It is placed as the heaviest member of group 16 (VIA) although a sufficiently stable isotope is not known at this time to allow chemical experiments to confirm its position as the heavier homologue to polonium . It was first detected in 2000 and since the discovery about 30 atoms of ununhexium
