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Het chemisch element californium (Cf), met een atoommassa van ongeveer 251 u, bezit geen stabiele isotopen en wordt dus geclassificeerd als radioactief element. De negentien radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een uur).
In de natuur komt geen californium voor: alle isotopen zijn synthetisch bereid in een laboratorium. De eerste synthetische isotoop was californium-245, in 1950.
De kortstlevende isotoop van californium is californium-238, met een halfwaardetijd van ongeveer 21,1 milliseconden. De langstlevende is californium-251, met een halfwaardetijd van 900 jaar.
Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin |
---|---|---|---|---|---|---|---|
Excitatie-energie | |||||||
237Cf | 98 | 139 | 237,06207(54) | 2,1(3) s | SS | 5/2+ | |
β+ | 237Bk | ||||||
α | 233Cm | ||||||
238Cf | 98 | 140 | 238,06141(43) | 21,1(13) ms | SS | 0+ | |
β+ (zelden) | 238Bk | ||||||
α (zelden) | 234Cm | ||||||
239Cf | 98 | 141 | 239,06242(23) | 60(30) s | α | 235Cm | 5/2+ |
β+ (zelden) | 239Bk | ||||||
240Cf | 98 | 142 | 240,06230(22) | 1,06(15) min | α (98%) | 236Cm | 0+ |
SS (2%) | |||||||
β+ (zelden) | 240Bk | ||||||
241Cf | 98 | 143 | 241,06373(27) | 3,78(70) min | β+ (75%) | 241Bk | 7/2− |
α (25%) | 237Cm | ||||||
242Cf | 98 | 144 | 242,06370(4) | 3,49(15) min | α (80%) | 238Cm | 0+ |
β+ (20%) | 242Bk | ||||||
SS (0,014%) | |||||||
243Cf | 98 | 145 | 243,06543(15) | 10,7(5) min | β+ (86%) | 243Bk | (1/2+) |
α (14%) | 239Cm | ||||||
244Cf | 98 | 146 | 244,066001(3) | 19,4(6) min | α (99%) | 240Cm | 0+ |
EV (1%) | 244Bk | ||||||
245Cf | 98 | 147 | 245,068049(3) | 45,0(15) min | β+ (64%) | 245Bk | (5/2+) |
α (36%) | 241Cm | ||||||
246Cf | 98 | 148 | 246,0688053(22) | 35,7(5) uur | α | 242Cm | 0+ |
EV (5 × 10−4%) | 246Bk | ||||||
SS (2 × 10−4%) | |||||||
247Cf | 98 | 149 | 247,071001(9) | 3,11(3) uur | EV (99,96%) | 247Bk | (7/2+) |
α (0,04%) | 243Cm | ||||||
248Cf | 98 | 150 | 248,072185(6) | 333,5(28) dagen | α (99,99%) | 244Cm | 0+ |
SS (0,0029%) | |||||||
249Cf | 98 | 151 | 249,0748535(24) | 351(2) jaar | α | 245Cm | 9/2− |
SS (5 × 10−7%) | |||||||
249mCf | 144,98(5) keV | 45(5) µs | 5/2+ | ||||
250Cf | 98 | 152 | 250,0764061(22) | 13,08(9) jaar | α (99,92%) | 246Cm | 0+ |
SS (0,077%) | |||||||
251Cf | 98 | 153 | 251,079587(5) | 900(40) jaar | α | 247Cm | 1/2+ |
252Cf | 98 | 154 | 252,081626(5) | 2,645(8) jaar | α (96,9%) | 248Cm | 0+ |
SS (3,09%) | |||||||
253Cf | 98 | 155 | 253,085133(7) | 17,81(8) dagen | β− (99,69%) | 253Es | (7/2+) |
α (0,31%) | 249Cm | ||||||
254Cf | 98 | 156 | 254,087323(13) | 60,5(2) dagen | SS (99,69%) | 0+ | |
α (0,31%) | 250Cm | ||||||
β−β− (zelden) | 254Fm | ||||||
255Cf | 98 | 157 | 255,09105(22) | 85(18) min | β− (99,99%) | 255Es | (7/2+) |
SS (0,001%) | |||||||
α (10−5%) | 251Cm | ||||||
256Cf | 98 | 158 | 256,09344(32) | 12,3(12) min | SS (99%) | 0+ | |
β− (1%) | 256Es | ||||||
α (10−6%) | 252Cm | ||||||
β−β− (zelden) | 256Fm |
1 | 18 | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | H | 2 | Periodiek systeem | 13 | 14 | 15 | 16 | 17 | He | |||||||||
2 | Li | Be | De links verwijzen naar isotopen per element | B | C | N | O | F | Ne | |||||||||
3 | Na | Mg | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Al | Si | P | S | Cl | Ar |
4 | K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr |
5 | Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe |
6 | Cs | Ba | ↓ | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn |
7 | Fr | Ra | ↓↓ | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og |
Lanthaniden | La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | |||
Actiniden | Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |
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