Isotopes of mendelevium - Reference.org

On this page

Isotopes of mendelevium

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.

We don't have any images related to Isotopes of mendelevium yet.

You can add one yourself here.

We don't have any YouTube videos related to Isotopes of mendelevium yet.

You can add one yourself here.

We don't have any PDF documents related to Isotopes of mendelevium yet.

You can add one yourself here.

We don't have any Books related to Isotopes of mendelevium yet.

You can add one yourself here.

We don't have any archived web articles related to Isotopes of mendelevium yet.

You can submit a link to a page to archive here.

List of isotopes

Nuclide¹	Z	N	Isotopic mass (Da)² ³ ⁴	Half-life ⁵	Decaymode ⁶ ⁷	Daughterisotope	Spin andparity ⁸ ⁹ ¹⁰
Nuclide¹	Excitation energy¹¹			Half-life ⁵	Decaymode ⁶ ⁷	Daughterisotope	Spin andparity ⁸ ⁹ ¹⁰
244Md¹²	101	143	244.08116(40)#	0.36(14) s	α	240Es	3+#
244Md¹²	101	143	244.08116(40)#	0.36(14) s	β+, SF (<14%)	(various)	3+#
244mMd¹³	200(150)# keV			~9 μs	IT	244Md	7+#
245Md	101	144	245.08086(28)#	0.38(10) s	α	241Es	(7/2−)
245mMd¹⁴	100(100)# keV			0.90(25) ms	SF	(various)	1/2−#
246Md	101	145	246.08171(28)#	0.92(18) s	α	242Es	1−#
246mMd¹⁵	60(60) keV			4.4(8) s	β+ (~67%)	246Fm	4−#
					α (<23%)	242Es
					β+, SF (>10%)	(various)
247Md¹⁶	101	146	247.08152(22)#	1.20(12) s	α (99.14%)	243Es	(7/2−)
247Md¹⁶	101	146	247.08152(22)#	1.20(12) s	SF (0.86%)	(various)	(7/2−)
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	248.08261(20)#	7(3) s	β+ (80%)	248Fm
					α (20%)	244Es
					β+, SF (<0.05%)	(various)
249Md	101	148	249.08286(18)	25.6(9) s	α (75%)	245Es	(7/2−)
249Md	101	148	249.08286(18)	25.6(9) s	β+ (25%)	249Fm	(7/2−)
249mMd¹⁷	100(100)# keV			1.9(9) s	α	245Es	(1/2−)
250Md	101	149	250.084165(98)	54(4) s	β+ (93.0%)	250Fm	2−#
					α (7.0%)	246Es
					β+, SF (0.026%)	(various)
250mMd	120(40) keV			42.4(45) s	α	246Es	7+#
251Md	101	150	251.084774(20)	4.21(23) min	β+ (90%)	251Fm	(7/2−)
251Md	101	150	251.084774(20)	4.21(23) min	α (10%)	247Es	(7/2−)
251mMd	53(8) keV			20# s			(1/2−)
252Md	101	151	252.086385(98)	2.3(8) min	β+	252Fm	1+#
253Md	101	152	253.087143(34)#	12(8) min	β+ (~99.3%)	253Fm	(7/2−)
253Md	101	152	253.087143(34)#	12(8) min	α (~0.7%)	249Es	(7/2−)
253mMd	60(30) keV			1# min			(1/2−)
254Md	101	153	254.08959(11)#	10(3) min	β+	254Fm	0−#
254mMd¹⁸	50(100)# keV			28(8) min	β+	254Fm	3−#
255Md	101	154	255.0910817(60)	27(2) min	β+ (93%)	255Fm	7/2−
255Md	101	154	255.0910817(60)	27(2) min	α (7%)	251Es	7/2−
256Md	101	155	256.09389(13)#	77.7(18) min	β+ (90.8%)	256Fm	(1−)
					α (9.2%)	252Es
					SF (<3%)	(various)
257Md	101	156	257.0955373(17)	5.52(5) h	EC (85%)	257Fm	(7/2−)
257Md	101	156	257.0955373(17)	5.52(5) h	α (15%)	253Es	(7/2−)
258Md	101	157	258.0984336(37)	51.59(29) d	α	254Es	(8−)#
					β− (<0.0015%)	258No
					β+ (<0.0015%)	258Fm
258mMd¹⁹	0(200)# keV			57.0(9) min	EC (85%)	258Fm	1−#
					SF (<15%)	(various)
					α (<1.2%)	254Es
259Md²⁰	101	158	259.10045(11)#	1.60(6) h	SF	(various)	7/2−#
260Md	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

Chronology of isotope discovery

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)²¹
260Md	1989	254Es+18O, 22Ne — transfer

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.

References

mMd – Excited nuclear isomer. /wiki/Nuclear_isomer ↩
Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf. /wiki/Doi_(identifier) ↩
( ) – 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). ↩
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. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩
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. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩
Modes of decay: EC:Electron captureSF:Spontaneous fission /wiki/Electron_capture ↩
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. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩
( ) spin value – Indicates spin with weak assignment arguments. ↩
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). ↩
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). ↩
Discovery of this isotope is disputed due to conflicting data.[3] ↩
Discovery of this isotope is disputed due to conflicting data.[3] ↩
Order of ground state and isomer is uncertain. ↩
Order of ground state and isomer is uncertain. ↩
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. https://doi.org/10.1140%2Fepja%2Fs10050-022-00663-4 ↩
Order of ground state and isomer is uncertain. ↩
Order of ground state and isomer is uncertain. ↩
Order of ground state and isomer is uncertain. ↩
Not directly synthesized, occurs as decay product of 259No ↩
see nobelium /wiki/Nobelium ↩