# Isotopen van lawrencium

Het chemisch element lawrencium (Lr), met een atoommassa van ongeveer 262 u, heeft geen stabiele isotopen en wordt dus geclassificeerd als radioactief element. De 11 radio-isotopen zijn instabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een seconde).
In de natuur komt geen lawrencium voor: alle isotopen zijn synthetisch bereid in een laboratorium. De eerste synthetische isotoop was $^{258}$Lr, in 1961.
De kortstlevende isotoop van lawrencium is $^{252}$Lr, met een halfwaardetijd van ongeveer 390 microseconden. De langstlevende is $^{262}$Lr, met een halfwaardetijd van 216 minuten.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | Kernspin |
| Kernspin |||
| $^{252}$Lr | 103 | 149 | 252,09537(27) | 390(90) ms | ${\ce {{^{252}_{103}Lr}->{^{248}_{101}Md}+\,_{2}^{4}\alpha }}$ (90%) | |
| $^{252}$Lr | 103 | 149 | 252,09537(27) | 390(90) ms | ${\ce {{^{252}_{103}Lr}->{^{252}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (10%) | |
| $^{252}$Lr | 103 | 149 | 252,09537(27) | 390(90) ms | SS (1%) | |
| $^{253}$Lr | 103 | 150 | 253,09521(24) | 580(70) ms | ${\ce {{^{253}_{103}Lr}->{^{249}_{101}Md}+\,_{2}^{4}\alpha }}$ (90%) | (7/2$^−$) |
| $^{253}$Lr | 103 | 150 | 253,09521(24) | 580(70) ms | SS (9%) | (7/2$^−$) |
| $^{253}$Lr | 103 | 150 | 253,09521(24) | 580(70) ms | ${\ce {{^{253}_{103}Lr}->{^{253}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (1%) | (7/2$^−$) |
| $^{253m}$Lr | 30(100) keV | 30(100) keV | 30(100) keV | 1,5(3) s | | (1/2$^−$) |
| $^{254}$Lr | 103 | 151 | 254,09645(36) | 13(3) s | ${\ce {{^{254}_{103}Lr}->{^{250}_{101}Md}+\,_{2}^{4}\alpha }}$ (78%) | |
| $^{254}$Lr | 103 | 151 | 254,09645(36) | 13(3) s | ${\ce {{^{254}_{103}Lr}->{^{254}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (22%) | |
| $^{254}$Lr | 103 | 151 | 254,09645(36) | 13(3) s | SS (0,1%) | |
| $^{255}$Lr | 103 | 152 | 255,09668(22) | 22(4) s | ${\ce {{^{255}_{103}Lr}->{^{251}_{101}Md}+\,_{2}^{4}\alpha }}$ (69%) | 7/2$^−$ |
| $^{255}$Lr | 103 | 152 | 255,09668(22) | 22(4) s | ${\ce {{^{255}_{103}Lr}->{^{255}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (30%) | 7/2$^−$ |
| $^{255}$Lr | 103 | 152 | 255,09668(22) | 22(4) s | SS (1%) | 7/2$^−$ |
| $^{256}$Lr | 103 | 153 | 256,09863(24) | 27(3) s | ${\ce {{^{256}_{103}Lr}->{^{252}_{101}Md}+\,_{2}^{4}\alpha }}$ (80%) | |
| $^{256}$Lr | 103 | 153 | 256,09863(24) | 27(3) s | ${\ce {{^{256}_{103}Lr}->{^{256}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (20%) | |
| $^{256}$Lr | 103 | 153 | 256,09863(24) | 27(3) s | SS (0,01%) | |
| $^{257}$Lr | 103 | 154 | 257,09956(22) | 646(25) ms | ${\ce {{^{257}_{103}Lr}->{^{253}_{101}Md}+\,_{2}^{4}\alpha }}$ (99,99%) | 9/2$^+$ |
| $^{257}$Lr | 103 | 154 | 257,09956(22) | 646(25) ms | ${\ce {{^{257}_{103}Lr}->{^{257}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (0,01%) | 9/2$^+$ |
| $^{257}$Lr | 103 | 154 | 257,09956(22) | 646(25) ms | SS (0,001%) | 9/2$^+$ |
| $^{258}$Lr | 103 | 155 | 258,10181(11) | 4,1(3) s | ${\ce {{^{258}_{103}Lr}->{^{254}_{101}Md}+\,_{2}^{4}\alpha }}$ (95%) | |
| $^{258}$Lr | 103 | 155 | 258,10181(11) | 4,1(3) s | ${\ce {{^{258}_{103}Lr}->{^{258}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (5%) | |
| $^{259}$Lr | 103 | 156 | 259,10290(8) | 6,2(3) s | ${\ce {{^{259}_{103}Lr}->{^{255}_{101}Md}+\,_{2}^{4}\alpha }}$ (77%) | 9/2$^+$ |
| $^{259}$Lr | 103 | 156 | 259,10290(8) | 6,2(3) s | SS (23%) | 9/2$^+$ |
| $^{259}$Lr | 103 | 156 | 259,10290(8) | 6,2(3) s | ${\ce {{^{259}_{103}Lr}->{^{259}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (0,5%) | 9/2$^+$ |
| $^{260}$Lr | 103 | 157 | 260,10550(12) | 2,7 min | ${\ce {{^{260}_{103}Lr}->{^{256}_{101}Md}+\,_{2}^{4}\alpha }}$ (75%) | |
| $^{260}$Lr | 103 | 157 | 260,10550(12) | 2,7 min | ${\ce {{^{260}_{103}Lr}->{^{260}_{102}No}+{e^{+}}+{\nu }_{e}}}$ (15%) | |
| $^{260}$Lr | 103 | 157 | 260,10550(12) | 2,7 min | SS (10%) | |
| $^{261}$Lr | 103 | 158 | 261,10688(22) | 44 min | SS | |
| $^{261}$Lr | 103 | 158 | 261,10688(22) | 44 min | ${\ce {{^{261}_{103}Lr}->{^{257}_{101}Md}+\,_{2}^{4}\alpha }}$ (zelden) | |
| $^{262}$Lr | 103 | 159 | 262,10963(22) | 216 min | ${\ce {{^{262}_{103}Lr}->{^{262}_{102}No}+{e^{+}}+{\nu }_{e}}}$ | |
| $^{262}$Lr | 103 | 159 | 262,10963(22) | 216 min | ${\ce {{^{262}_{103}Lr}->{^{258}_{101}Md}+\,_{2}^{4}\alpha }}$ (zelden) | |

## Overzicht van isotopen per element

* (en) R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (online versie van de cd-rom)
* (en) G. Audi, A.H. Wapstra, C. Thibault, J. Blachot & O. Bersillon (2003) - The NUBASE evaluation of nuclear and decay properties, Nuclear Physics A, 729, pp. 3-128
* (en) J.R. de Laeter, J.K. Böhlke, P. De Bièvre, H. Hidaka, H.S. Peiser, K.J.R. Rosman & P.D.P. Taylor (2003) - Atomic weights of the elements. Review 2000 (IUPAC Technical Report), Pure and Applied Chemistry, 75 (6), pp. 683–800
* (en) M.E. Wieser (2006) - Atomic weights of the elements 2005 (IUPAC Technical Report), Pure and Applied Chemistry, 78 (11), pp. 2051–2066
* (en) David R. Lide (2004) - CRC Handbook of Chemistry and Physics (85th ed.), hoofdstuk 11, CRC Press - ISBN 978-0849304859
$^{251}$Lr · $^{252}$Lr · $^{253}$Lr · $^{253m}$Lr · $^{254}$Lr · $^{255}$Lr · $^{256}$Lr · $^{257}$Lr · $^{258}$Lr · $^{259}$Lr · $^{260}$Lr · $^{261}$Lr · $^{262}$Lr · $^{263}$Lr · $^{264}$Lr · $^{265}$Lr · $^{266}$Lr