Isotopen van lawrencium
Het chemisch element lawrencium atoommassa van ongeveer 262 u , heeft geen stabiele isotopen 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
Excitatie-energie
252 Lr
103
149
252,09537(27)
390(90) ms
Lr
103
252
⟶ ⟶ -->
Md
101
248
+
2
4
α α -->
{\displaystyle {\ce {{^{252}_{103}Lr}->{^{248}_{101}Md}+\,_{2}^{4}\alpha }}}
Lr
103
252
⟶ ⟶ -->
No
102
252
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{252}_{103}Lr}->{^{252}_{102}No}+{e^{+}}+{\nu }_{e}}}}
SS (1%)
253 Lr
103
150
253,09521(24)
580(70) ms
Lr
103
253
⟶ ⟶ -->
Md
101
249
+
2
4
α α -->
{\displaystyle {\ce {{^{253}_{103}Lr}->{^{249}_{101}Md}+\,_{2}^{4}\alpha }}}
(7/2− )
SS (9%)
Lr
103
253
⟶ ⟶ -->
No
102
253
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{253}_{103}Lr}->{^{253}_{102}No}+{e^{+}}+{\nu }_{e}}}}
253m Lr
30(100) keV
1,5(3) s
(1/2− )
254 Lr
103
151
254,09645(36)
13(3) s
Lr
103
254
⟶ ⟶ -->
Md
101
250
+
2
4
α α -->
{\displaystyle {\ce {{^{254}_{103}Lr}->{^{250}_{101}Md}+\,_{2}^{4}\alpha }}}
Lr
103
254
⟶ ⟶ -->
No
102
254
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{254}_{103}Lr}->{^{254}_{102}No}+{e^{+}}+{\nu }_{e}}}}
SS (0,1%)
255 Lr
103
152
255,09668(22)
22(4) s
Lr
103
255
⟶ ⟶ -->
Md
101
251
+
2
4
α α -->
{\displaystyle {\ce {{^{255}_{103}Lr}->{^{251}_{101}Md}+\,_{2}^{4}\alpha }}}
7/2−
Lr
103
255
⟶ ⟶ -->
No
102
255
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{255}_{103}Lr}->{^{255}_{102}No}+{e^{+}}+{\nu }_{e}}}}
SS (1%)
256 Lr
103
153
256,09863(24)
27(3) s
Lr
103
256
⟶ ⟶ -->
Md
101
252
+
2
4
α α -->
{\displaystyle {\ce {{^{256}_{103}Lr}->{^{252}_{101}Md}+\,_{2}^{4}\alpha }}}
Lr
103
256
⟶ ⟶ -->
No
102
256
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{256}_{103}Lr}->{^{256}_{102}No}+{e^{+}}+{\nu }_{e}}}}
SS (0,01%)
257 Lr
103
154
257,09956(22)
646(25) ms
Lr
103
257
⟶ ⟶ -->
Md
101
253
+
2
4
α α -->
{\displaystyle {\ce {{^{257}_{103}Lr}->{^{253}_{101}Md}+\,_{2}^{4}\alpha }}}
9/2+
Lr
103
257
⟶ ⟶ -->
No
102
257
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{257}_{103}Lr}->{^{257}_{102}No}+{e^{+}}+{\nu }_{e}}}}
SS (0,001%)
258 Lr
103
155
258,10181(11)
4,1(3) s
Lr
103
258
⟶ ⟶ -->
Md
101
254
+
2
4
α α -->
{\displaystyle {\ce {{^{258}_{103}Lr}->{^{254}_{101}Md}+\,_{2}^{4}\alpha }}}
Lr
103
258
⟶ ⟶ -->
No
102
258
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{258}_{103}Lr}->{^{258}_{102}No}+{e^{+}}+{\nu }_{e}}}}
259 Lr
103
156
259,10290(8)
6,2(3) s
Lr
103
259
⟶ ⟶ -->
Md
101
255
+
2
4
α α -->
{\displaystyle {\ce {{^{259}_{103}Lr}->{^{255}_{101}Md}+\,_{2}^{4}\alpha }}}
9/2+
SS (23%)
Lr
103
259
⟶ ⟶ -->
No
102
259
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{259}_{103}Lr}->{^{259}_{102}No}+{e^{+}}+{\nu }_{e}}}}
260 Lr
103
157
260,10550(12)
2,7 min
Lr
103
260
⟶ ⟶ -->
Md
101
256
+
2
4
α α -->
{\displaystyle {\ce {{^{260}_{103}Lr}->{^{256}_{101}Md}+\,_{2}^{4}\alpha }}}
Lr
103
260
⟶ ⟶ -->
No
102
260
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{260}_{103}Lr}->{^{260}_{102}No}+{e^{+}}+{\nu }_{e}}}}
SS (10%)
261 Lr
103
158
261,10688(22)
44 min
SS
Lr
103
261
⟶ ⟶ -->
Md
101
257
+
2
4
α α -->
{\displaystyle {\ce {{^{261}_{103}Lr}->{^{257}_{101}Md}+\,_{2}^{4}\alpha }}}
262 Lr
103
159
262,10963(22)
216 min
Lr
103
262
⟶ ⟶ -->
No
102
262
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{262}_{103}Lr}->{^{262}_{102}No}+{e^{+}}+{\nu }_{e}}}}
Lr
103
262
⟶ ⟶ -->
Md
101
258
+
2
4
α α -->
{\displaystyle {\ce {{^{262}_{103}Lr}->{^{258}_{101}Md}+\,_{2}^{4}\alpha }}}
Overzicht van isotopen per element
Bronnen
(en ) R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (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 ISBN 978-0849304859
