Isotope van dubnium
Die chemiese element dubnium (Db), met ’n atoommassa van 262,1138 u, het geen stabiele isotope nie en word dus as ’n radioaktiewe element geklassifiseer. Die 12 isotope is onstabiel en het ’n relatief kort halfleeftyd (die meeste minder as ’n sekonde).
In die natuur kom geen dubnium voor nie; alle isotope is sinteties in ’n laboratorium berei. Die eerste sintetiese isotoop was 261Db, in 1968.
Die kortslewende isotoop van dubnium is 259Db, met ’n halfleeftyd van ongeveer 0,51 sekondes. Die langslewende een is 268Db, met ’n halfleeftyd van 32 uur.
Oorsig
wysigNuklied | Z (p) | N (n) | Isotopiese massa (u) | Halfleeftyd | Radioaktiewe verval | VP | Kernspin |
---|---|---|---|---|---|---|---|
Opwekkingsenergie | |||||||
256Db | 105 | 151 | 256,10813(31) | 1,9(4) s | α | 252Lr | |
SS | |||||||
β+ | 256Rf | ||||||
257Db | 105 | 152 | 257,10772(24) | 1,53(17) s | α (82%) | 253Lr | (9/2+) |
SS (17%) | |||||||
β+ (1%) | 257Rf | ||||||
257mDb | 100(100) keV | 790(130) ms | (1/2-) | ||||
258Db | 105 | 153 | 258,10923(37) | 4,5(6) s | α (64%) | 254Lr | |
β+ (36%) | 258Rf | ||||||
SS (1%) | |||||||
258mDb | 60(100) keV | 20(10) s | EV | 258Rf | |||
IV (selde) | 258Db | ||||||
259Db | 105 | 154 | 259,10961(23) | 0,51(16) s | α | 255Lr | |
260Db | 105 | 155 | 260,11130(25) | 1,52(13) s | α (88%) | 256Lr | |
SS (9,6%) | |||||||
β+ (2%) | 260Rf | ||||||
260mDb | 19 s | ||||||
261Db | 105 | 156 | 261,11206(25) | 1,8(4) s | SS (50%) | ||
α (50%) | 257Lr | ||||||
262Db | 105 | 157 | 262,11408(20) | 35(5) s | SS (71%) | ||
α (26%) | 258Lr | ||||||
β+ (3%) | 262Rf | ||||||
263Db | 105 | 158 | 263,11499(18) | 29(9) s | SS (50%) | ||
α (42%) | 259Lr | ||||||
β+ (8%) | 263Rf | ||||||
266Db | 105 | 161 | 266,12103(39) | 20 min | SS | ||
EV | 266Rf | ||||||
267Db | 105 | 162 | 267,12238(50) | 73 min | SS | ||
268Db | 105 | 163 | 268,12545(57) | 32 uur | SS | ||
EV | 268Rf | ||||||
270Db | 105 | 165 | 270,13071(77) | 23,15 uur | SS |
Isotope per element
wysig1H | 2He | 3Li | 4Be | 5B | 6C | 7N | 8O | 9F | 10Ne | 11Na | 12Mg | 13Al | 14Si | 15P | 16S | 17Cl | 18Ar | 19K | |
20Ca | 21Sc | 22Ti | 23V | 24Cr | 25Mn | 26Fe | 27Co | 28Ni | 29Cu | 30Zn | 31Ga | 32Ge | 33As | 34Se | 35Br | 36Kr | 37Rb | 38Sr | 39Y |
40Zr | 41Nb | 42Mo | 43Tc | 44Ru | 45Rh | 46Pd | 47Ag | 48Cd | 49In | 50Sn | 51Sb | 52Te | 53I | 54Xe | 55Cs | 56Ba | 57La | 58Ce | 59Pr |
60Nd | 61Pm | 62Sm | 63Eu | 64Gd | 65Tb | 66Dy | 67Ho | 68Er | 69Tm | 70Yb | 71Lu | 72Hf | 73Ta | 74W | 75Re | 76Os | 77Ir | 78Pt | 79Au |
80Hg | 81Tl | 82Pb | 83Bi | 84Po | 85At | 86Rn | 87Fr | 88Ra | 89Ac | 90Th | 91Pa | 92U | 93Np | 94Pu | 95Am | 96Cm | 97Bk | 98Cf | 99Es |
100Fm | 101Md | 102No | 103Lr | 104Rf | 105Db | 106Sg | 107Bh | 108Hs | 109Mt | 110Ds | 111Rg | 112Cn | 113Nh | 114Fl | 115Mc | 116Lv | 117Ts | 118Og |
Bronne
wysig- R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (aanlyn weergawe van die CD-ROM)
- 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
- 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
- M.E. Wieser (2006) - Atomic weights of the elements 2005 (IUPAC Technical Report), Pure and Applied Chemistry, 78 (11), pp. 2051–2066
- David R. Lide (2004) - CRC Handbook of Chemistry and Physics (85ste uitg.), hoofstuk 11, CRC Press - ISBN 978-0849304859
- Hierdie artikel is vertaal uit die Nederlandse Wikipedia