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(Top) 1 List of isotopes 2 Chronology of isotope discovery 3 References

Isotopes of mendelevium

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Isotopesofmendelevium (₁₀₁Md)

Main isotopes^[1]			Decay
	abundance	half-life (t_1/2)	mode	product
²⁵⁶Md	synth	1.17 h	ε	²⁵⁶Fm
²⁵⁷Md	synth	5.52 h	ε	²⁵⁷Fm
			α	²⁵³Es
			SF	–
²⁵⁸Md	synth	51.5 d	α	²⁵⁴Es
			ε	²⁵⁸Fm
			β⁻	²⁵⁸No
²⁵⁹Md	synth	1.60 h	SF	–
²⁵⁹Md	synth	1.60 h	α	²⁵⁵Es
²⁶⁰Md	synth	31.8 d	SF	–
			α	²⁵⁶Es
			ε	²⁶⁰Fm
			β⁻	²⁶⁰No

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Mendelevium (₁₀₁Md) is a synthetic element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was ²⁵⁶Md (which was also the first isotope of any element produced one atom at a time) in 1955. There are 17 known radioisotopes, ranging in atomic mass from ²⁴⁴Md to ²⁶⁰Md, and 5 isomers. The longest-lived isotope is ²⁵⁸Md with a half-life of 51.3 days, and the longest-lived isomer is ^258mMd with a half-life of 57 minutes.

List of isotopes[edit]

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da) ^{[n 2]}^{[n 3]}	Half-life	Decay mode ^{[n 4]}	Daughter isotope	Spin and parity ^{[n 5]}^{[n 6]}
Nuclide ^{[n 1]}	Excitation energy^{[n 6]}			Half-life	Decay mode ^{[n 4]}	Daughter isotope	Spin and parity ^{[n 5]}^{[n 6]}
²⁴⁴Md^[2]	101	143		0.30+0.19 −0.09 s	α	²⁴⁰Es
²⁴⁵Md^[2]	101	144	245.08081(33)#	0.33+0.15 −0.08 s	α	²⁴¹Es	7/2−#
²⁴⁵Md^[2]	101	144	245.08081(33)#	0.33+0.15 −0.08 s	β⁺ (rare)	²⁴⁵Fm	7/2−#
^245mMd^{[n 7]}	200(100)# keV			0.90(25) ms	SF	(various)	1/2−#
²⁴⁶Md^[3]	101	145	246.08171(28)#	0.9(2) s	α	²⁴²Es
²⁴⁶Md^[3]	101	145	246.08171(28)#	0.9(2) s	β⁺?	²⁴⁶Fm
^246mMd^{[n 7]}	60(60) keV			4.4(8) s	β⁺ (>67%)	²⁴⁶Fm
					α (<23%)	²⁴²Es
					β⁺, SF (>10%)	(various)
²⁴⁷Md^[4]	101	146	247.08152(22)#	1.20(12) s	α (99.14%)	²⁴³Es	(7/2−)
					SF (0.86%)	(various)
					β⁺?	²⁴⁷Fm
^247mMd	153 keV			0.23(3) s	α (80%)	²⁴³Es	(1/2−)
^247mMd	153 keV			0.23(3) s	SF (20%)	(various)	(1/2−)
²⁴⁸Md	101	147	248.08282(26)#	7(3) s	β⁺ (80%)	²⁴⁸Fm
					α (20%)	²⁴⁴Es
					β⁺, SF (.05%)	(various)
²⁴⁹Md^[5]	101	148	249.08291(22)#	26(1) s	α (75%)	²⁴⁵Es	(7/2−)
²⁴⁹Md^[5]	101	148	249.08291(22)#	26(1) s	β⁺ (25%)	²⁴⁹Fm	(7/2−)
^249mMd^[6]^{[n 7]}	100(100)# keV			1.5+1.2 −0.5 s	α	²⁴⁵Es	(1/2−)
²⁵⁰Md^[7]	101	149	250.08442(32)#	54(4) s	β⁺ (93.0%)	²⁵⁰Fm
					α (7.0%)	²⁴⁶Es
					β⁺, SF (0.026%)	(various)
²⁵¹Md^[8]	101	150	251.084774(20)	4.27(26) min	β⁺ (90%)	²⁵¹Fm	(7/2−)
²⁵¹Md^[8]	101	150	251.084774(20)	4.27(26) min	α (10%)	²⁴⁷Es	(7/2−)
²⁵²Md	101	151	252.08643(14)#	2.3(8) min	β⁺	²⁵²Fm
²⁵²Md	101	151	252.08643(14)#	2.3(8) min	α (rare)^[9]	²⁴⁸Es
²⁵³Md	101	152	253.08714(3)#	12(8) min [6.4+11.6 −3.6 min]	β⁺ (~99%)^[10]	²⁵³Fm	(7/2−)
²⁵³Md	101	152	253.08714(3)#	12(8) min [6.4+11.6 −3.6 min]	α (~1%)	²⁴⁹Es	(7/2−)
²⁵⁴Md	101	153	254.08959(11)#	10(3) min	β⁺	²⁵⁴Fm	(0−)
²⁵⁴Md	101	153	254.08959(11)#	10(3) min	α (rare)	²⁵⁰Es	(0−)
^254mMd^{[n 7]}	50(100)# keV			28(8) min	β⁺	²⁵⁴Fm	(3−)
^254mMd^{[n 7]}	50(100)# keV			28(8) min	α (rare)	²⁵⁰Es	(3−)
²⁵⁵Md	101	154	255.091084(7)	27(2) min	β⁺ (92%)	²⁵⁵Fm	(7/2−)
					α (8%)	²⁵¹Es
					SF (.15%)	(various)
²⁵⁶Md	101	155	256.09389(13)#	77(2) min	β⁺ (89%)	²⁵⁶Fm	(1−)
²⁵⁶Md	101	155	256.09389(13)#	77(2) min	α (11%)	²⁵²Es	(1−)
²⁵⁷Md	101	156	257.0955424(29)	5.52(5) h	EC (84.8%)	²⁵⁷Fm	(7/2−)
					α (15.2%)	²⁵³Es
					SF (rare)	(various)
²⁵⁸Md^[11]	101	157	258.098431(5)	51.59(29) d	α	²⁵⁴Es	(8−)#
					β⁻ (<0.0015%)	²⁵⁸No
					β⁺ (<0.0015%)	²⁵⁸Fm
^258mMd^{[n 7]}	0(200)# keV			57.0(9) min	EC	²⁵⁸Fm	1−#
					SF (<15%)	(various)
					α (<1.2%)	²⁵⁴Es
					β⁻ (rare)	²⁵⁸No
²⁵⁹Md^{[n 8]}^[12]	101	158	259.10051(22)#	1.60(6) h	SF	(various)	7/2−#
²⁵⁹Md^{[n 8]}^[12]	101	158	259.10051(22)#	1.60(6) h	α (rare)	²⁵⁵Es	7/2−#
²⁶⁰Md^[13]	101	159	260.10365(34)#	27.8(8) d	SF	(various)
					α (<5%)	²⁵⁶Es
					EC (<5%)	²⁶⁰Fm
					β⁻ (<3.5%)	²⁶⁰No
This table header & footer: view

^ ^mMd – Excited nuclear isomer.

^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

^ Modes of decay:

EC:	Electron capture
SF:	Spontaneous fission

^ ( ) spin value – Indicates spin with weak assignment arguments.

^ ^a ^b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

^ ^a ^b ^c ^d ^e Order of ground state and isomer is uncertain.

^ Not directly synthesized, occurs as decay product of ²⁵⁹No

Chronology of isotope discovery[edit]

Isotope	Discovered	Reaction
²⁴⁴Md	2020	²⁰⁹Bi(⁴⁰Ar,5n)
²⁴⁵Md	1996	²⁰⁹Bi(⁴⁰Ar,4n)
²⁴⁶Md	1996	²⁰⁹Bi(⁴⁰Ar,3n)
²⁴⁷Md	1981	²⁰⁹Bi(⁴⁰Ar,2n)
²⁴⁸Md	1973	²⁴¹Am(¹²C,5n)
²⁴⁹Md	1973	²⁴¹Am(¹²C,4n)
²⁵⁰Md	1973	²⁴³Am(¹²C,5n), ²⁴³Am(¹³C,6n)
²⁵¹Md	1973	²⁴³Am(¹²C,4n), ²⁴³Am(¹³C,5n)
²⁵²Md	1973	²⁴³Am(¹³C,4n)
²⁵³Md	1992	²⁴³Am(¹³C,3n)
²⁵⁴Md	1970	²⁵³Es(α,3n)
²⁵⁵Md	1958	²⁵³Es(α,2n)
²⁵⁶Md	1955	²⁵³Es(α,n)
²⁵⁷Md	1964	²⁵²Cf(¹¹B,α2n)
²⁵⁸Md	1970	²⁵⁵Es(α,n)
²⁵⁹Md	1982	²⁴⁸Cm(¹⁸O,α3n)^[14]
²⁶⁰Md	1989	²⁵⁴Es+¹⁸O, ²²Ne — transfer

References[edit]

^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

^ ^a ^b Khuyagbaatar, J.; Albers, H. M.; Block, M.; Brand, H.; Cantemir, R. A.; Di Nitto, A.; Düllmann, Ch. E.; Götz, M.; Götz, S.; Heßberger, F. P.; Jäger, E.; Kindler, B.; Kratz, J. V.; Krier, J.; Kurz, N.; Lommel, B.; Lens, L.; Mistry, A.; Schausten, B.; Uusitalo, J.; Yakushev, A. (1 October 2020). "Search for Electron-Capture Delayed Fission in the New Isotope ²⁴⁴Md". Physical Review Letters. 125 (14): 142504. Bibcode:2020PhRvL.125n2504K. doi:10.1103/PhysRevLett.125.142504. PMID 33064498. S2CID 223546973.

^ Antalic, S.; Heßberger, F. P.; Hofmann, S.; Ackermann, D.; Heinz, S.; Kindler, B.; Kojouharov, I.; Kuusiniemi, P.; Leino, M.; Lommel, B.; Mann, R.; Šáro, Š. (20 November 2009). "Studies of neutron-deficient mendelevium isotopes at SHIP". The European Physical Journal A. 43 (1): 35. doi:10.1140/epja/i2009-10896-0. ISSN 1434-601X. S2CID 121963345.

^ Heßberger, F. P.; Antalic, S.; Giacoppo, F.; Andel, B.; Ackermann, D.; Block, M.; Heinz, S.; Khuyagbaatar, J.; Kojouharov, I.; Venhart, M. (25 January 2022). "Alpha-gamma decay studies of ²⁴⁷Md". The European Physical Journal A. 58 (1): 11. Bibcode:2022EPJA...58...11H. doi:10.1140/epja/s10050-022-00663-4. ISSN 1434-601X. S2CID 246281669.

^ Briselet, R.; Theisen, Ch.; Vandebrouck, M.; Marchix, A.; Airiau, M.; Auranen, K.; Badran, H.; Boilley, D.; Calverley, T.; Cox, D.; Déchery, F.; Defranchi Bisso, F.; Drouart, A.; Gall, B.; Goigoux, T.; Grahn, T.; Greenlees, P. T.; Hauschild, K.; Herzan, A.; Herzberg, R. D.; Jakobsson, U.; Julin, R.; Juutinen, S.; Konki, J.; Leino, M.; Lightfoot, A.; Lopez-Martens, A.; Mistry, A.; Nieminen, P.; Pakarinen, J.; Papadakis, P.; Partanen, J.; Peura, P.; Rahkila, P.; Rubert, J.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Scholey, C.; Sorri, J.; Stolze, S.; Sulignano, B.; Uusitalo, J.; Ward, A.; Zielińska, M. (14 February 2019). "Production cross section and decay study of $^{243}\mathrm{Es}$ and $^{249}\mathrm{Md}$". Physical Review C. 99 (2): 024614. arXiv:1809.10400. doi:10.1103/PhysRevC.99.024614. S2CID 119533032.

^ Heßberger, F.P.; Hofmann, S.; Ackermann, D.; Ninov, V.; Leino, M.; Münzenberg, G.; Saro, S.; Lavrentev, A.; Popeko, A.G.; Yeremin, A.V.; Stodel, Ch. (1 September 2001). "Decay properties of neutron-deficient isotopes 256, 257Db, 255Rf, 252, 253Lr". The European Physical Journal A - Hadrons and Nuclei. 12 (1): 57–67. Bibcode:2001EPJA...12...57H. doi:10.1007/s100500170039. ISSN 1434-601X. S2CID 117896888. Retrieved 1 July 2023.

^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (1 March 2021). "The NUBASE2020 evaluation of nuclear physics properties *". Chinese Physics C, High Energy Physics and Nuclear Physics. 45 (3): 030001. Bibcode:2021ChPhC..45c0001K. doi:10.1088/1674-1137/abddae. ISSN 1674-1137. OSTI 1774641. S2CID 233794940.

^ Chatillon, A.; Theisen, Ch.; Greenlees, P. T.; Auger, G.; Bastin, J. E.; Bouchez, E.; Bouriquet, B.; Casandjian, J. M.; Cee, R.; Clément, E.; Dayras, R.; de France, G.; de Toureil, R.; Eeckhaudt, S.; Görgen, A.; Grahn, T.; Grévy, S.; Hauschild, K.; Herzberg, R. -D.; Ikin, P. J. C.; Jones, G. D.; Jones, P.; Julin, R.; Juutinen, S.; Kettunen, H.; Korichi, A.; Korten, W.; Le Coz, Y.; Leino, M.; Lopez-Martens, A.; Lukyanov, S. M.; Penionzhkevich, Yu. E.; Perkowski, J.; Pritchard, A.; Rahkila, P.; Rejmund, M.; Saren, J.; Scholey, C.; Siem, S.; Saint-Laurent, M. G.; Simenel, C.; Sobolev, Yu. G.; Stodel, Ch.; Uusitalo, J.; Villari, A.; Bender, M.; Bonche, P.; Heenen, P. -H. (1 November 2006). "Spectroscopy and single-particle structure of the odd- Z heavy elements 255Lr, 251Md and 247Es". The European Physical Journal A - Hadrons and Nuclei. 30 (2): 397–411. Bibcode:2006EPJA...30..397C. doi:10.1140/epja/i2006-10134-5. ISSN 1434-601X. S2CID 123346991. Retrieved 1 July 2023.

^ Antalic, S.; Heßberger, F. P.; Ackermann, D.; Heinz, S.; Hofmann, S.; Kalaninová, Z.; Kindler, B.; Khuyagbaatar, J.; Kojouharov, I.; Kuusiniemi, P.; Leino, M.; Lommel, B.; Mann, R.; Nishio, K.; Šáro, Š.; Streicher, B.; Sulignano, B.; Venhart, M. (20 May 2011). "Isomeric states in ²⁵³No and ²⁵³Fm". The European Physical Journal A. 47 (5): 62. Bibcode:2011EPJA...47...62A. doi:10.1140/epja/i2011-11062-y. ISSN 1434-601X. S2CID 121080273.

^ see nobelium

Isotope masses from:
- M. Wang; G. Audi; A. H. Wapstra; F. G. Kondev; M. MacCormick; X. Xu; et al. (2012). "The AME2012 atomic mass evaluation (II). Tables, graphs and references" (PDF). Chinese Physics C. 36 (12): 1603–2014. Bibcode:2012ChPhC..36....3M. doi:10.1088/1674-1137/36/12/003. S2CID 250839471.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
- M. Thoennessen (2012). "Discovery of Isotopes of Elements with Z≥100". Atomic Data and Nuclear Data Tables. 99 (3): 312–344. arXiv:1203.2105. Bibcode:2013ADNDT..99..312T. doi:10.1016/j.adt.2012.03.003. S2CID 94982856.

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