Isotopen van nobelium
Het chemisch element nobelium atoommassa van ongeveer 259 u , bezit geen stabiele isotopen radioactief element . De 12 radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een seconde ).
In de natuur komt geen nobelium voor: alle isotopen zijn synthetisch bereid in een laboratorium . De eerste synthetische isotoop was 254 No, in 1966 .
De kortstlevende isotoop van nobelium is 250 No, met een halfwaardetijd van ongeveer 5,7 microseconden . De langstlevende is 259 No, met een halfwaardetijd van 58 minuten .
Overzicht
Nuclide
Z (p )
N (n )
Isotopische massa (u)
Halveringstijd
Radioactief verval
Kernspin
Excitatie-energie
250 No
102
148
250,08751(22)
5,7(8) µs
SS (99,95%)
0+
No
102
250
⟶ ⟶ -->
Fm
100
246
+
2
4
α α -->
{\displaystyle {\ce {{^{250}_{102}No}->{^{246}_{100}Fm}+\,_{2}^{4}\alpha }}}
No
102
250
⟶ ⟶ -->
Md
101
250
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{250}_{102}No}->{^{250}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
−4 %)
251 No
102
149
251,08901(19)
0,78(2) s
No
102
251
⟶ ⟶ -->
Fm
100
247
+
2
4
α α -->
{\displaystyle {\ce {{^{251}_{102}No}->{^{247}_{100}Fm}+\,_{2}^{4}\alpha }}}
7/2+
SS (10%)
No
102
251
⟶ ⟶ -->
Md
101
251
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{251}_{102}No}->{^{251}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
251m No
110(180) keV
1,7(10) s
9/2−
252 No
102
150
252,088977(14)
2,27(14) s
No
102
252
⟶ ⟶ -->
Fm
100
248
+
2
4
α α -->
{\displaystyle {\ce {{^{252}_{102}No}->{^{248}_{100}Fm}+\,_{2}^{4}\alpha }}}
0+
SS (26,9%)
No
102
252
⟶ ⟶ -->
Md
101
252
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{252}_{102}No}->{^{252}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
253 No
102
151
253,09068(11)
1,62(15) min
No
102
253
⟶ ⟶ -->
Fm
100
249
+
2
4
α α -->
{\displaystyle {\ce {{^{253}_{102}No}->{^{249}_{100}Fm}+\,_{2}^{4}\alpha }}}
(9/2− )
No
102
253
⟶ ⟶ -->
Md
101
253
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{253}_{102}No}->{^{253}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
SS (10−3 %)
253m No
129(19) keV
31 µs
5/2+
254 No
102
152
254,090955(19)
51(10) s
No
102
254
⟶ ⟶ -->
Fm
100
250
+
2
4
α α -->
{\displaystyle {\ce {{^{254}_{102}No}->{^{250}_{100}Fm}+\,_{2}^{4}\alpha }}}
0+
No
102
254
⟶ ⟶ -->
Md
101
254
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{254}_{102}No}->{^{254}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
SS (0,31%)
254m No
500(100) keV
0,28(4) s
IT → 254 102 0+
No
102
254
⟶ ⟶ -->
Fm
100
250
+
2
4
α α -->
{\displaystyle {\ce {{^{254}_{102}No}->{^{250}_{100}Fm}+\,_{2}^{4}\alpha }}}
255 No
102
153
255,093241(11)
3,1(2) min
No
102
255
⟶ ⟶ -->
Fm
100
251
+
2
4
α α -->
{\displaystyle {\ce {{^{255}_{102}No}->{^{251}_{100}Fm}+\,_{2}^{4}\alpha }}}
(1/2+ )
No
102
255
⟶ ⟶ -->
Md
101
255
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{255}_{102}No}->{^{255}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
256 No
102
154
256,094283(8)
2,91(5) s
No
102
256
⟶ ⟶ -->
Fm
100
252
+
2
4
α α -->
{\displaystyle {\ce {{^{256}_{102}No}->{^{252}_{100}Fm}+\,_{2}^{4}\alpha }}}
0+
SS (0,55%)
No
102
256
+
e
− − -->
⟶ ⟶ -->
Md
101
256
+
ν ν -->
e
{\displaystyle {\ce {{^{256}_{102}No}+{e^{-}}->{^{256}_{101}Md}+{\nu }_{e}}}}
257 No
102
155
257,096877(23)
25(2) s
No
102
257
⟶ ⟶ -->
Fm
100
253
+
2
4
α α -->
{\displaystyle {\ce {{^{257}_{102}No}->{^{253}_{100}Fm}+\,_{2}^{4}\alpha }}}
(7/2+ )
No
102
257
⟶ ⟶ -->
Md
101
257
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{257}_{102}No}->{^{257}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
258 No
102
156
258,09821(22)
1,2(2) ms
SS (99,99%)
0+
No
102
258
⟶ ⟶ -->
Fm
100
254
+
2
4
α α -->
{\displaystyle {\ce {{^{258}_{102}No}->{^{254}_{100}Fm}+\,_{2}^{4}\alpha }}}
No
102
258
⟶ ⟶ -->
Md
101
258
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{258}_{102}No}->{^{258}_{101}Md}+{e^{+}}+{\nu }_{e}}}}
259 No
102
157
259,10103(11)
58(5) min
No
102
259
⟶ ⟶ -->
Fm
100
255
+
2
4
α α -->
{\displaystyle {\ce {{^{259}_{102}No}->{^{255}_{100}Fm}+\,_{2}^{4}\alpha }}}
(9/2+ )
No
102
259
+
e
− − -->
⟶ ⟶ -->
Md
101
259
+
ν ν -->
e
{\displaystyle {\ce {{^{259}_{102}No}+{e^{-}}->{^{259}_{101}Md}+{\nu }_{e}}}}
SS (10%)
260 No
102
158
260,10264(22)
106(8) ms
SS
0+
262 No
102
160
262,10730(48)
± 5 ms
SS
0+
Overzicht van isotopen per element
Bronnen, noten en/of referenties
(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
