Isotopes of ununquadium

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Ununquadium (Uuq) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 289Uuq in 1999 (or possibly 1998). Ununquadium has five confirmed isotopes, and possibly 2 nuclear isomers. The longest-lived isotope is 289Uuq with a half-life of 2.6 seconds.

[edit] Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life decay mode(s)[n 1] daughter
isotope(s)
nuclear
spin
excitation energy
285Uuq 114 171 285.18370(111)# 125 ms α 281Cn 3/2+#
286Uuq[n 2] 114 172 286.18386(83)# 130 ms SF (60%)[n 3] (variable) 0+
α (40%) 282Cn
287Uuq 114 173 287.18560(83)# 510(+180-100) ms α 283Cn
287mUuq[n 4] 5.5s α 283Cn
288Uuq 114 174 288.18569(91)# .8(+27-16) s α 284Cn 0+
289Uuq 114 175 289.18728(79)# 2.6(+12-7) s α 285Cn 5/2+#
289mUuq[n 4] 1.1 min α 285Cn
  1. ^ Abbreviations:
    SF: Spontaneous fission
  2. ^ Not directly synthesized, produced in decay chain of 294Uuo
  3. ^ Heaviest nuclide known to undergo spontaneous fission
  4. ^ a b Existence of this isomer is uncertain

[edit] Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.
  • It is theorized that 298Uuq will have a relatively long half-life

[edit] References

Isotopes of ununtrium Isotopes of ununquadium Isotopes of ununpentium
Index to isotope pages · Table of nuclides
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