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Isotopes of lawrencium



Lawrencium (Lr) has no stable isotopes. A standard atomic mass cannot be given.

Additional recommended knowledge

Lawrencium has also been called eka-lutetium.

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
251Lr 103 148 251.09436(32)# 150# µs
252Lr 103 149 252.09537(27)# 390(90) ms [0.36(+11-7) s]
253Lr 103 150 253.09521(24)# 580(70) ms [0.57(+7-6) s] (7/2-)
253mLr 30(100)# keV 1.5(3) s [1.5(+3-2) s] (1/2-)
254Lr 103 151 254.09645(36)# 13(3) s
255Lr 103 152 255.09668(22)# 22(4) s 7/2-#
256Lr 103 153 256.09863(24)# 27(3) s
257Lr 103 154 257.09956(22)# 646(25) ms 9/2+#
258Lr 103 155 258.10181(11)# 4.1(3) s
259Lr 103 156 259.10290(8)# 6.2(3) s 9/2+#
260Lr 103 157 260.10550(12)# 3.0(5) min
261Lr 103 158 261.10688(22)# 39(12) min
262Lr 103 159 262.10963(22)# ~4 h
263Lr 103 160 263.11129(39)# 5# h
264Lr 103 161 264.11404(47)# 10# h
265Lr 103 162 265.11584(77)# 10# h
266Lr 103 163 266.11931(70)# 1# h

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