Isotopes of nobelium

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

[edit] 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+

[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.

[edit] 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
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