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Isotopes of mendelevium



Mendelevium (Md) has no stable isotopes. A standard atomic mass cannot be given.

Additional recommended knowledge

Mendelevium has also been called eka-thulium.

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
245Md 101 144 245.08083(35)# 0.90(25) ms (1/2-)#
245mMd 200(100)# keV 400(200) ms [0.35(+23-16) s] (7/2+)
246Md 101 145 246.08189(35)# 1.0(4) s
247Md 101 146 247.08164(35)# 1.12(22) s 1/2-#
247mMd ~0.2 s
248Md 101 147 248.08282(26)# 7(3) s
249Md 101 148 249.08301(24)# 24(4) s (7/2-)
249mMd 100(100)# keV 1.9(9) s (1/2-)
250Md 101 149 250.08442(32)# 52(6) s
251Md 101 150 251.08484(22)# 4.0(5) min 7/2-#
252Md 101 151 252.08656(21)# 2.3(8) min
253Md 101 152 253.08728(22)# 12(8) min [6(+12-3) min] 7/2-#
254Md 101 153 254.08966(11)# 10(3) min (0-)
254mMd 50(100)# keV 28(8) min (3-)
255Md 101 154 255.091083(7) 27(2) min (7/2-)
256Md 101 155 256.09406(6) 77(2) min (1-)
257Md 101 156 257.095541(3) 5.52(5) h (7/2-)
258Md 101 157 258.098431(5) 51.5(3) d (8-)#
258mMd 0(200)# keV 57.0(9) min 1-#
259Md 101 158 259.10051(22)# 1.60(6) h 7/2-#
260Md 101 159 260.10365(34)# 31.8(5) d
261Md 101 160 261.10572(70)# 40# min 7/2-#
262Md 101 161 262.10887(63)# 3# min

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