Isotopes of mendelevium: Difference between revisions
Appearance
Content deleted Content added
XinaNicole (talk | contribs) mNo edit summary |
XinaNicole (talk | contribs) |
||
Line 8: | Line 8: | ||
! <br />isotopic mass (u)<br /> |
! <br />isotopic mass (u)<br /> |
||
! rowspan="2" | half-life |
! rowspan="2" | half-life |
||
! rowspan="2" | decay<br>mode(s)<ref>http://www.nucleonica.net/unc.aspx</ref><ref group="n">Abbreviations:<br>EC: [[Electron capture]]<br>IT: [[Isomeric transition]]<br>SF: [[Spontaneous fission]]</ref> |
|||
! rowspan="2" | daughter<br>isotope(s) |
|||
! rowspan="2" | nuclear<br />spin |
! rowspan="2" | nuclear<br />spin |
||
|- |
|- |
||
! colspan="3" | excitation energy |
! colspan="3" | excitation energy |
||
|- |
|- |
||
| <sup>245</sup>Md |
| rowspan=2|<sup>245</sup>Md |
||
| style="text-align:right" | 101 |
| rowspan=2 style="text-align:right" | 101 |
||
| style="text-align:right" | 144 |
| rowspan=2 style="text-align:right" | 144 |
||
| 245.08083(35)# |
| rowspan=2|245.08083(35)# |
||
| 0.90(25) ms |
| rowspan=2|0.90(25) ms |
||
| [[Spontaneous fission|SF]] |
|||
| (1/2-)# |
|||
| (various) |
|||
| rowspan=2|(1/2-)# |
|||
|- |
|- |
||
| [[alpha decay|α]] (rare) |
|||
| style="text-indent:1em" | <sup>245m</sup>Md |
|||
| <sup>241</sup>Es |
|||
| colspan="3" style="text-indent:2em" | 200(100)# keV |
|||
| 400(200) ms<br>[0.35(+23-16) s] |
|||
| (7/2+) |
|||
|- |
|- |
||
| <sup> |
| rowspan=2 style="text-indent:1em" | <sup>245m</sup>Md |
||
| style="text- |
| rowspan=2 colspan="3" style="text-indent:2em" | 200(100)# keV |
||
| rowspan=2|400(200) ms<br>[0.35(+23-16) s] |
|||
| style="text-align:right" | 145 |
|||
| α |
|||
| 246.08189(35)# |
|||
| <sup>241</sup>Es |
|||
| 1.0(4) s |
|||
| rowspan=2|(7/2+) |
|||
| |
|||
|- |
|- |
||
| <sup> |
| [[beta decay|β<sup>+</sup>]] (rare) |
||
| <sup>245</sup>Fm |
|||
| style="text-align:right" | 101 |
|||
| style="text-align:right" | 146 |
|||
| 247.08164(35)# |
|||
| 1.12(22) s |
|||
| 1/2-# |
|||
|- |
|- |
||
| |
| rowspan=2|<sup>246</sup>Md |
||
| |
| rowspan=2 style="text-align:right" | 101 |
||
| rowspan=2 style="text-align:right" | 145 |
|||
| ~0.2 s |
|||
| rowspan=2|246.08189(35)# |
|||
| |
|||
| rowspan=2|1.0(4) s |
|||
| α |
|||
| <sup>242</sup>Es |
|||
| rowspan=2| |
|||
|- |
|- |
||
| <sup> |
| β<sup>+</sup> (rare) |
||
| <sup>246</sup>Fm |
|||
| style="text-align:right" | 101 |
|||
| style="text-align:right" | 147 |
|||
| 248.08282(26)# |
|||
| 7(3) s |
|||
| |
|||
|- |
|- |
||
| <sup> |
| rowspan=2|<sup>247</sup>Md |
||
| style="text-align:right" | 101 |
| rowspan=2 style="text-align:right" | 101 |
||
| style="text-align:right" | |
| rowspan=2 style="text-align:right" | 146 |
||
| |
| rowspan=2|247.08164(35)# |
||
| |
| rowspan=2|1.12(22) s |
||
| |
| SF |
||
| (various) |
|||
| rowspan=2|1/2-# |
|||
|- |
|||
| α (rare) |
|||
| <sup>243</sup>Es |
|||
|- |
|||
| rowspan=2 style="text-indent:1em" | <sup>247m</sup>Md |
|||
| rowspan=2 colspan="3" style="text-indent:2em" | |
|||
| rowspan=2|~0.2 s |
|||
| α (99.99%) |
|||
| <sup>243</sup>Es |
|||
| rowspan=2| |
|||
|- |
|||
| SF (1E-4%) |
|||
| (various) |
|||
|- |
|||
| rowspan=3|<sup>248</sup>Md |
|||
| rowspan=3 style="text-align:right" | 101 |
|||
| rowspan=3 style="text-align:right" | 147 |
|||
| rowspan=3|248.08282(26)# |
|||
| rowspan=3|7(3) s |
|||
| β<sup>+</sup> (80%) |
|||
| <sup>248</sup>Fm |
|||
| rowspan=3| |
|||
|- |
|||
| α (20%) |
|||
| <sup>244</sup>Es |
|||
|- |
|||
| β<sup>+</sup>, SF (.05%) |
|||
| (various) |
|||
|- |
|||
| rowspan=2|<sup>249</sup>Md |
|||
| rowspan=2 style="text-align:right" | 101 |
|||
| rowspan=2 style="text-align:right" | 148 |
|||
| rowspan=2|249.08301(24)# |
|||
| rowspan=2|24(4) s |
|||
| α (60%) |
|||
| <sup>245</sup>Es |
|||
| rowspan=2|(7/2-) |
|||
|- |
|||
| β<sup>+</sup> (40%) |
|||
| <sup>249</sup>Fm |
|||
|- |
|- |
||
| style="text-indent:1em" | <sup>249m</sup>Md |
| style="text-indent:1em" | <sup>249m</sup>Md |
||
| colspan="3" style="text-indent:2em" | 100(100)# keV |
| colspan="3" style="text-indent:2em" | 100(100)# keV |
||
| 1.9(9) s |
| 1.9(9) s |
||
| |
|||
| |
|||
| (1/2-) |
| (1/2-) |
||
|- |
|- |
||
| <sup>250</sup>Md |
| rowspan=3|<sup>250</sup>Md |
||
| style="text-align:right" | 101 |
| rowspan=3 style="text-align:right" | 101 |
||
| style="text-align:right" | 149 |
| rowspan=3 style="text-align:right" | 149 |
||
| 250.08442(32)# |
| rowspan=3|250.08442(32)# |
||
| 52(6) s |
| rowspan=3|52(6) s |
||
| β<sup>+</sup> (93%) |
|||
| |
|||
| <sup>250</sup>Fm |
|||
| rowspan=3| |
|||
|- |
|- |
||
| α (7%) |
|||
| <sup>251</sup>Md |
|||
| <sup>246</sup>Es |
|||
| style="text-align:right" | 101 |
|||
| style="text-align:right" | 150 |
|||
| 251.08484(22)# |
|||
| 4.0(5) min |
|||
| 7/2-# |
|||
|- |
|- |
||
| <sup> |
| β<sup>+</sup>, SF (.02%) |
||
| (various) |
|||
| style="text-align:right" | 101 |
|||
| style="text-align:right" | 151 |
|||
| 252.08656(21)# |
|||
| 2.3(8) min |
|||
| |
|||
|- |
|- |
||
| <sup> |
| rowspan=2|<sup>251</sup>Md |
||
| style="text-align:right" | 101 |
| rowspan=2 style="text-align:right" | 101 |
||
| style="text-align:right" | |
| rowspan=2 style="text-align:right" | 150 |
||
| |
| rowspan=2|251.08484(22)# |
||
| rowspan=2|4.0(5) min |
|||
| 12(8) min<br>[6(+12-3) min] |
|||
| β<sup>+</sup> (90%) |
|||
| 7/2-# |
|||
| <sup>251</sup>Fm |
|||
| rowspan=2|7/2-# |
|||
|- |
|- |
||
| α (10%) |
|||
| <sup>254</sup>Md |
|||
| <sup>247</sup>Es |
|||
| style="text-align:right" | 101 |
|||
| style="text-align:right" | 153 |
|||
| 254.08966(11)# |
|||
| 10(3) min |
|||
| (0-) |
|||
|- |
|- |
||
| |
| rowspan=2|<sup>252</sup>Md |
||
| |
| rowspan=2 style="text-align:right" | 101 |
||
| rowspan=2 style="text-align:right" | 151 |
|||
| 28(8) min |
|||
| rowspan=2|252.08656(21)# |
|||
| (3-) |
|||
| rowspan=2|2.3(8) min |
|||
| β<sup>+</sup> (50%) |
|||
| <sup>252</sup>Fm |
|||
| rowspan=2| |
|||
|- |
|- |
||
| α (50%) |
|||
| <sup>255</sup>Md |
|||
| <sup>248</sup>Es |
|||
| style="text-align:right" | 101 |
|||
| style="text-align:right" | 154 |
|||
| 255.091083(7) |
|||
| 27(2) min |
|||
| (7/2-) |
|||
|- |
|- |
||
| <sup> |
| rowspan=2|<sup>253</sup>Md |
||
| style="text-align:right" | 101 |
| rowspan=2 style="text-align:right" | 101 |
||
| style="text-align:right" | |
| rowspan=2 style="text-align:right" | 152 |
||
| rowspan=2|253.08728(22)# |
|||
| 256.09406(6) |
|||
| |
| rowspan=2|12(8) min<br>[6(+12-3) min] |
||
| β<sup>+</sup> |
|||
| (1-) |
|||
| <sup>249</sup>Fm |
|||
| rowspan=2|7/2-# |
|||
|- |
|- |
||
| α |
|||
| <sup>257</sup>Md |
|||
| <sup>249</sup>Es |
|||
| style="text-align:right" | 101 |
|||
| style="text-align:right" | 156 |
|||
| 257.095541(3) |
|||
| 5.52(5) h |
|||
| (7/2-) |
|||
|- |
|- |
||
| <sup> |
| rowspan=2|<sup>254</sup>Md |
||
| style="text-align:right" | 101 |
| rowspan=2 style="text-align:right" | 101 |
||
| style="text-align:right" | |
| rowspan=2 style="text-align:right" | 153 |
||
| rowspan=2|254.08966(11)# |
|||
| 258.098431(5) |
|||
| |
| rowspan=2|10(3) min |
||
| β<sup>+</sup> |
|||
| (8-)# |
|||
| <sup>254</sup>Fm |
|||
| rowspan=2|(0-) |
|||
|- |
|- |
||
| α (rare) |
|||
| style="text-indent:1em" | <sup>258m</sup>Md |
|||
| <sup>250</sup>Es |
|||
| colspan="3" style="text-indent:2em" | 0(200)# keV |
|||
| 57.0(9) min |
|||
| 1-# |
|||
|- |
|- |
||
| <sup> |
| rowspan=2 style="text-indent:1em" | <sup>254m</sup>Md |
||
| style="text- |
| rowspan=2 colspan="3" style="text-indent:2em" | 50(100)# keV |
||
| rowspan=2|28(8) min |
|||
| style="text-align:right" | 158 |
|||
| β<sup>+</sup> |
|||
| 259.10051(22)# |
|||
| <sup>254</sup>Fm |
|||
| 1.60(6) h |
|||
| |
| rowspan=2|(3-) |
||
|- |
|- |
||
| α (rare) |
|||
| <sup>260</sup>Md<ref group="n">First isotope synthesized, also first isotope of any element to be produced one atom at a time</ref> |
|||
| <sup>250</sup>Es |
|||
| style="text-align:right" | 101 |
|||
|- |
|||
| style="text-align:right" | 159 |
|||
| rowspan=3|<sup>255</sup>Md |
|||
| 260.10365(34)# |
|||
| rowspan=3 style="text-align:right" | 101 |
|||
| 27.8(8) d |
|||
| rowspan=3 style="text-align:right" | 154 |
|||
| |
|||
| rowspan=3|255.091083(7) |
|||
| rowspan=3|27(2) min |
|||
| β<sup>+</sup> (92%) |
|||
| <sup>255</sup>Fm |
|||
| rowspan=3|(7/2-) |
|||
|- |
|||
| α (8%) |
|||
| <sup>251</sup>Es |
|||
|- |
|||
| SF (.15%) |
|||
| (various) |
|||
|- |
|||
| rowspan=2|<sup>256</sup>Md |
|||
| rowspan=2 style="text-align:right" | 101 |
|||
| rowspan=2 style="text-align:right" | 155 |
|||
| rowspan=2|256.09406(6) |
|||
| rowspan=2|77(2) min |
|||
| β<sup>+</sup> (89%) |
|||
| <sup>256</sup>Fm |
|||
| rowspan=2|(1-) |
|||
|- |
|||
| α (11%) |
|||
| <sup>252</sup>Es |
|||
|- |
|||
| rowspan=3|<sup>257</sup>Md |
|||
| rowspan=3 style="text-align:right" | 101 |
|||
| rowspan=3 style="text-align:right" | 156 |
|||
| rowspan=3|257.095541(3) |
|||
| rowspan=3|5.52(5) h |
|||
| [[Electron capture|EC]] (84.8%) |
|||
| <sup>257</sup>Fm |
|||
| rowspan=3|(7/2-) |
|||
|- |
|||
| α (15.2%) |
|||
| <sup>253</sup>Es |
|||
|- |
|||
| SF (1%) |
|||
| (various) |
|||
|- |
|||
| rowspan=3|<sup>258</sup>Md |
|||
| rowspan=3 style="text-align:right" | 101 |
|||
| rowspan=3 style="text-align:right" | 157 |
|||
| rowspan=3|258.098431(5) |
|||
| rowspan=3|51.5(3) d |
|||
| α (99.99%) |
|||
| <sup>254</sup>Es |
|||
| rowspan=3|(8-)# |
|||
|- |
|||
| β<sup>-</sup> (.0015%) |
|||
| <sup>258</sup>No |
|||
|- |
|||
| β<sup>+</sup> (.0015%) |
|||
| <sup>258</sup>Fm |
|||
|- |
|||
| rowspan=4 style="text-indent:1em" | <sup>258m</sup>Md |
|||
| rowspan=4 colspan="3" style="text-indent:2em" | 0(200)# keV |
|||
| rowspan=4|57.0(9) min |
|||
| EC (70%) |
|||
| <sup>258</sup>Fm |
|||
| rowspan=4|1-# |
|||
|- |
|||
| SF (20%) |
|||
| (various) |
|||
|- |
|||
| β<sup>-</sup> (10%) |
|||
| <sup>258</sup>No |
|||
|- |
|||
| α (1.2%) |
|||
| <sup>254</sup>Es |
|||
|- |
|||
| rowspan=2|<sup>259</sup>Md |
|||
| rowspan=2 style="text-align:right" | 101 |
|||
| rowspan=2 style="text-align:right" | 158 |
|||
| rowspan=2|259.10051(22)# |
|||
| rowspan=2|1.60(6) h |
|||
| SF (98.7%) |
|||
| (various) |
|||
| rowspan=2|7/2-# |
|||
|- |
|||
| α (1.3%) |
|||
| <sup>255</sup>Es |
|||
|- |
|||
| rowspan=4|<sup>260</sup>Md<ref group="n">First isotope synthesized, also first isotope of any element to be produced one atom at a time</ref> |
|||
| rowspan=4 style="text-align:right" | 101 |
|||
| rowspan=4 style="text-align:right" | 159 |
|||
| rowspan=4|260.10365(34)# |
|||
| rowspan=4|27.8(8) d |
|||
| SF (85%) |
|||
| (various) |
|||
| rowspan=4| |
|||
|- |
|||
| α (5%) |
|||
| <sup>256</sup>Es |
|||
|- |
|||
| EC (5%) |
|||
| <sup>260</sup>Fm |
|||
|- |
|||
| β<sup>-</sup> (3.5%) |
|||
| <sup>260</sup>No |
|||
|- |
|- |
||
| <sup>261</sup>Md |
| <sup>261</sup>Md |
||
Line 154: | Line 285: | ||
| 261.10572(70)# |
| 261.10572(70)# |
||
| 40# min |
| 40# min |
||
| |
|||
| |
|||
| 7/2-# |
| 7/2-# |
||
|- |
|- |
||
Line 161: | Line 294: | ||
| 262.10887(63)# |
| 262.10887(63)# |
||
| 3# min |
| 3# min |
||
| |
|||
| |
|||
| |
| |
||
|} |
|} |
Revision as of 14:35, 22 May 2011
Mendelevium (Md) has no stable isotopes. There are 18 known radioisotopes, ranging in atomic mass from 245Md to 262Md, and 5 isomers. The isotope with the longest half-life is 258Md with a half-life of 51.3 days, and the longest-lived isomer is 258mMd with a half-life of 58.0 minutes. A standard atomic mass cannot be given due to mendelevium being artificial.
Table
nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s)[1][n 1] |
daughter isotope(s) |
nuclear spin |
---|---|---|---|---|---|---|---|
excitation energy | |||||||
245Md | 101 | 144 | 245.08083(35)# | 0.90(25) ms | SF | (various) | (1/2-)# |
α (rare) | 241Es | ||||||
245mMd | 200(100)# keV | 400(200) ms [0.35(+23-16) s] |
α | 241Es | (7/2+) | ||
β+ (rare) | 245Fm | ||||||
246Md | 101 | 145 | 246.08189(35)# | 1.0(4) s | α | 242Es | |
β+ (rare) | 246Fm | ||||||
247Md | 101 | 146 | 247.08164(35)# | 1.12(22) s | SF | (various) | 1/2-# |
α (rare) | 243Es | ||||||
247mMd | ~0.2 s | α (99.99%) | 243Es | ||||
SF (1E-4%) | (various) | ||||||
248Md | 101 | 147 | 248.08282(26)# | 7(3) s | β+ (80%) | 248Fm | |
α (20%) | 244Es | ||||||
β+, SF (.05%) | (various) | ||||||
249Md | 101 | 148 | 249.08301(24)# | 24(4) s | α (60%) | 245Es | (7/2-) |
β+ (40%) | 249Fm | ||||||
249mMd | 100(100)# keV | 1.9(9) s | (1/2-) | ||||
250Md | 101 | 149 | 250.08442(32)# | 52(6) s | β+ (93%) | 250Fm | |
α (7%) | 246Es | ||||||
β+, SF (.02%) | (various) | ||||||
251Md | 101 | 150 | 251.08484(22)# | 4.0(5) min | β+ (90%) | 251Fm | 7/2-# |
α (10%) | 247Es | ||||||
252Md | 101 | 151 | 252.08656(21)# | 2.3(8) min | β+ (50%) | 252Fm | |
α (50%) | 248Es | ||||||
253Md | 101 | 152 | 253.08728(22)# | 12(8) min [6(+12-3) min] |
β+ | 249Fm | 7/2-# |
α | 249Es | ||||||
254Md | 101 | 153 | 254.08966(11)# | 10(3) min | β+ | 254Fm | (0-) |
α (rare) | 250Es | ||||||
254mMd | 50(100)# keV | 28(8) min | β+ | 254Fm | (3-) | ||
α (rare) | 250Es | ||||||
255Md | 101 | 154 | 255.091083(7) | 27(2) min | β+ (92%) | 255Fm | (7/2-) |
α (8%) | 251Es | ||||||
SF (.15%) | (various) | ||||||
256Md | 101 | 155 | 256.09406(6) | 77(2) min | β+ (89%) | 256Fm | (1-) |
α (11%) | 252Es | ||||||
257Md | 101 | 156 | 257.095541(3) | 5.52(5) h | EC (84.8%) | 257Fm | (7/2-) |
α (15.2%) | 253Es | ||||||
SF (1%) | (various) | ||||||
258Md | 101 | 157 | 258.098431(5) | 51.5(3) d | α (99.99%) | 254Es | (8-)# |
β- (.0015%) | 258No | ||||||
β+ (.0015%) | 258Fm | ||||||
258mMd | 0(200)# keV | 57.0(9) min | EC (70%) | 258Fm | 1-# | ||
SF (20%) | (various) | ||||||
β- (10%) | 258No | ||||||
α (1.2%) | 254Es | ||||||
259Md | 101 | 158 | 259.10051(22)# | 1.60(6) h | SF (98.7%) | (various) | 7/2-# |
α (1.3%) | 255Es | ||||||
260Md[n 2] | 101 | 159 | 260.10365(34)# | 27.8(8) d | SF (85%) | (various) | |
α (5%) | 256Es | ||||||
EC (5%) | 260Fm | ||||||
β- (3.5%) | 260No | ||||||
261Md | 101 | 160 | 261.10572(70)# | 40# min | 7/2-# | ||
262Md | 101 | 161 | 262.10887(63)# | 3# min |
- ^ Abbreviations:
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission - ^ First isotope synthesized, also first isotope of any element to be produced one atom at a time
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:
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.
{{cite journal}}
: CS1 maint: multiple names: authors list (link)
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.
- Isotopic compositions and standard atomic masses from:
- J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
{{cite journal}}
: CS1 maint: multiple names: authors list (link) - M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.
{{cite journal}}
: Unknown parameter|laysummary=
ignored (help)
- J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.
{{cite journal}}
: CS1 maint: multiple names: authors list (link) - National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005.
{{cite web}}
: Check date values in:|accessdate=
(help) - N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide (ed.). CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0849304859.
{{cite book}}
: Unknown parameter|nopp=
ignored (|no-pp=
suggested) (help)
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.