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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

same experiment they also detected a decay chain which corresponded to the first observed decay of ununquadium

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

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

It is placed as the heaviest member of group 15 (VA) although a sufficiently stable isotope is not known at this time that would allow chemical experiments to confirm its position. It was first observed in 2003 and only about 30 atoms of ununpentium have been synthesized to date, with just

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 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

The radioactive ununoctium atom is very unstable, and since 2002, only three atoms (possibly four) of the isotope 294 Uuo have been detected. [ 10 ] While this allowed for very little experimental characterization of its properties and possible compounds , theoretical calculations have resulted

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