Isotopen van dubnium
Het chemisch element dubnium atoommassa van 262,1138 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 dubnium voor: alle isotopen zijn synthetisch bereid in een laboratorium . De eerste synthetische isotoop was 261 Db, in 1968 .
De kortstlevende isotoop van dubnium is 259 Db, met een halfwaardetijd van ongeveer 0,51 seconden . De langstlevende is 268 Db, met een halfwaardetijd van ongeveer 32 uur .
Overzicht
Nuclide
Z (p )
N (n )
Isotopische massa (u)
Halveringstijd
Radioactief verval
Kernspin
Excitatie-energie
256 Db
105
151
256,10813(31)
1,9(4) s
Db
105
256
⟶ ⟶ -->
Lr
103
252
+
2
4
α α -->
{\displaystyle {\ce {{^{256}_{105}Db}->{^{252}_{103}Lr}+\,_{2}^{4}\alpha }}}
SS
Db
105
256
⟶ ⟶ -->
Rf
104
256
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{256}_{105}Db}->{^{256}_{104}Rf}+{e^{+}}+{\nu }_{e}}}}
257 Db
105
152
257,10772(24)
1,53(17) s
Db
105
257
⟶ ⟶ -->
Lr
103
253
+
2
4
α α -->
{\displaystyle {\ce {{^{257}_{105}Db}->{^{253}_{103}Lr}+\,_{2}^{4}\alpha }}}
(9/2+ )
SS (17%)
Db
105
257
⟶ ⟶ -->
Rf
104
257
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{257}_{105}Db}->{^{257}_{104}Rf}+{e^{+}}+{\nu }_{e}}}}
257m Db
100(100) keV
790(130) ms
(1/2− )
258 Db
105
153
258,10923(37)
4,5(6) s
Db
105
258
⟶ ⟶ -->
Lr
103
254
+
2
4
α α -->
{\displaystyle {\ce {{^{258}_{105}Db}->{^{254}_{103}Lr}+\,_{2}^{4}\alpha }}}
Db
105
258
⟶ ⟶ -->
Rf
104
258
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{258}_{105}Db}->{^{258}_{104}Rf}+{e^{+}}+{\nu }_{e}}}}
SS (1%)
258m Db
60(100) keV
20(10) s
Db
105
258
+
e
− − -->
⟶ ⟶ -->
Rf
104
258
+
ν ν -->
e
{\displaystyle {\ce {{^{258}_{105}Db}+{e^{-}}->{^{258}_{104}Rf}+{\nu }_{e}}}}
IT → 258 105
259 Db
105
154
259,10961(23)
0,51(16) s
Db
105
259
⟶ ⟶ -->
Lr
103
255
+
2
4
α α -->
{\displaystyle {\ce {{^{259}_{105}Db}->{^{255}_{103}Lr}+\,_{2}^{4}\alpha }}}
260 Db
105
155
260,11130(25)
1,52(13) s
Db
105
260
⟶ ⟶ -->
Lr
103
256
+
2
4
α α -->
{\displaystyle {\ce {{^{260}_{105}Db}->{^{256}_{103}Lr}+\,_{2}^{4}\alpha }}}
SS (9,6%)
Db
105
260
⟶ ⟶ -->
Rf
104
260
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{260}_{105}Db}->{^{260}_{104}Rf}+{e^{+}}+{\nu }_{e}}}}
260m Db
19 s
261 Db
105
156
261,11206(25)
1,8(4) s
SS (50%)
Db
105
261
⟶ ⟶ -->
Lr
103
257
+
2
4
α α -->
{\displaystyle {\ce {{^{261}_{105}Db}->{^{257}_{103}Lr}+\,_{2}^{4}\alpha }}}
262 Db
105
157
262,11408(20)
35(5) s
SS (71%)
Db
105
262
⟶ ⟶ -->
Lr
103
258
+
2
4
α α -->
{\displaystyle {\ce {{^{262}_{105}Db}->{^{258}_{103}Lr}+\,_{2}^{4}\alpha }}}
Db
105
262
⟶ ⟶ -->
Rf
104
262
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{262}_{105}Db}->{^{262}_{104}Rf}+{e^{+}}+{\nu }_{e}}}}
263 Db
105
158
263,11499(18)
29(9) s
SS (50%)
Db
105
263
⟶ ⟶ -->
Lr
103
259
+
2
4
α α -->
{\displaystyle {\ce {{^{263}_{105}Db}->{^{259}_{103}Lr}+\,_{2}^{4}\alpha }}}
Db
105
259
⟶ ⟶ -->
Rf
104
259
+
e
+
+
ν ν -->
e
{\displaystyle {\ce {{^{259}_{105}Db}->{^{259}_{104}Rf}+{e^{+}}+{\nu }_{e}}}}
266 Db
105
161
266,12103(39)
20 min
SS
Db
105
266
+
e
− − -->
⟶ ⟶ -->
Rf
104
266
+
ν ν -->
e
{\displaystyle {\ce {{^{266}_{105}Db}+{e^{-}}->{^{266}_{104}Rf}+{\nu }_{e}}}}
267 Db
105
162
267,12238(50)
73 min
SS
268 Db
105
163
268,12545(57)
32 uur
SS
Db
105
268
+
e
− − -->
⟶ ⟶ -->
Rf
104
268
+
ν ν -->
e
{\displaystyle {\ce {{^{268}_{105}Db}+{e^{-}}->{^{268}_{104}Rf}+{\nu }_{e}}}}
270 Db
105
165
270,13071(77)
23,15 uur
SS
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
