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Roentgenium was called unununium before it was formally discovered. Roentgenium was first observed in 1994 and several isotopes have been synthesized since its first discovery. The most stable known isotope is 281 Rg with a half-life of ~20 seconds, which decays by spontaneous fission, like

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

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

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

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

It was first synthesized in 1982 and several isotopes are currently known. The heaviest and the most stable isotope known is Mt-278, with a half-life of ~8 s. Contents 1 History 1.1 Official discovery 1.2 Naming 1.3 Future experiments 2 Isotopes and nuclear properties

This reaction was first studied in 1974 by the team at Dubna. They measured a spontaneous fission activity assigned to 256 Rf. [ 1 ] The reaction was further studied in 1985 by the GSI team who measured the decay properties of the isotopes 257 Rf and 256 Rf. The team were able to determine

It is placed as the heaviest member of the group 13 (IIIA) elements although a sufficiently stable isotope is not known at this time that would allow chemical experiments to confirm its position. It was first detected in 2003 in the decay of ununpentium and was synthesized directly in 2004

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