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Isotopes of nobelium



Nobelium (No) has no stable isotopes. A standard atomic mass cannot be given.

Additional recommended knowledge

Nobelium has also been called eka-ytterbium.

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
248No 102 146 248.08660(32)# <2 µs 0+
249No 102 147 249.08783(37)# 57(12) µs [54(+15-10) µs] 5/2+#
250No 102 148 250.08751(22)# 5.7(8) µs 0+
251No 102 149 251.08901(19)# 0.78(2) s 7/2+#
251mNo 110(180)# keV 1.7(10) s 9/2-#
252No 102 150 252.088977(14) 2.27(14) s 0+
253No 102 151 253.09068(11)# 1.62(15) min (9/2-)#
253mNo 129(19) keV 31 µs 5/2+#
254No 102 152 254.090955(19) 51(10) s 0+
254mNo 500(100)# keV 0.28(4) s 0+
255No 102 153 255.093241(11) 3.1(2) min (1/2+)
256No 102 154 256.094283(8) 2.91(5) s 0+
257No 102 155 257.096877(23) 25(2) s (7/2+)
258No 102 156 258.09821(22)# 1.2(2) ms 0+
259No 102 157 259.10103(11)# 58(5) min (9/2+)#
260No 102 158 260.10264(22)# 106(8) ms 0+
261No 102 159 261.10575(32)# 3# h 3/2+#
262No 102 160 262.10730(48)# ~5 ms 0+
263No 102 161 263.11055(53)# 20# min
264No 102 162 264.11235(69)# 1# min 0+

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.

References

  • Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
  • Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
  • Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
    • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
    • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
    • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


Isotopes of mendelevium Isotopes of nobelium Isotopes of lawrencium
Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_nobelium". A list of authors is available in Wikipedia.
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