Chromium isotopes are varieties of the chemical element of chromium having a different number of neutrons in the nucleus. Chromium isotopes are known with mass numbers from 42 to 67 (number of protons 24, neutrons from 18 to 43) and 2 nuclear isomers .
Natural chromium is a mixture of four stable isotopes:
- 50 Cr ( isotopic abundance 4.345%)
- 52 Cr (isotopic abundance 83.789%)
- 53 Cr (isotopic abundance 9.501%)
- 54 Cr (isotopic abundance 2,365%).
Among artificial isotopes, the longest-lived 51 Cr ( half-life 27 days). The half-life of the rest does not exceed one day.
The 51 Cr isotope is used as a neutrino source for testing neutrino telescopes . [1] An isotope is obtained by irradiating 50 Cr targets in nuclear reactors .
Chromium Isotope Table
| Symbol nuclide | Z ( p ) | N ( n ) | Isotope mass [2] ( a.m. ) | Period half-life [3] (T 1/2 ) | Spin and Parity cores [3] |
|---|---|---|---|---|---|
| Excitation energy | |||||
| 42 Cr | 24 | eighteen | 42,00643 | 14 ms | 0+ |
| 43 Cr | 24 | 19 | 42,99771 | 21.6 ms | 3/2 + |
| 44 Cr | 24 | twenty | 43.98555 | 54 ms | 0+ |
| 45 Cr | 24 | 21 | 44,97964 | 50 ms | 7 / 2- |
| 45m Cr | 50 keV | 1 ms | 3/2 + | ||
| 46 Cr | 24 | 22 | 45,968359 | 260 ms | 0+ |
| 47 Cr | 24 | 23 | 46.962900 | 500 ms | 3 / 2- |
| 48 Cr | 24 | 24 | 47.954032 | 21.56 h | 0+ |
| 49 Cr | 24 | 25 | 48.9513357 | 42.3 min | 5 / 2- |
| 50 Cr | 24 | 26 | 49.9460442 | stable | 0+ |
| 51 Cr | 24 | 27 | 50,9447674 | 27.7025 d | 7 / 2- |
| 52 Cr | 24 | 28 | 51,9405075 | stable | 0+ |
| 53 Cr | 24 | 29th | 52,9406494 | stable | 3 / 2- |
| 54 Cr | 24 | thirty | 53.9388804 | stable | 0+ |
| 55 Cr | 24 | 31 | 54,9408397 | 3,497 min | 3 / 2- |
| 56 Cr | 24 | 32 | 55,9406531 | 5.94 min | 0+ |
| 57 Cr | 24 | 33 | 56,943613 | 21.1 s | 3 / 2- |
| 58 Cr | 24 | 34 | 57,94435 | 7.0 s | 0+ |
| 59 Cr | 24 | 35 | 58,94859 | 460 ms | 5 / 2- |
| 59m Cr | 503.0 keV | 96 μs | 9/2 + | ||
| 60 Cr | 24 | 36 | 59.95008 | 560 ms | 0+ |
| 61 Cr | 24 | 37 | 60,95472 | 261 ms | 5 / 2- |
| 62 Cr | 24 | 38 | 61.95661 | 199 ms | 0+ |
| 63 Cr | 24 | 39 | 62.96186 | 129 ms | 1/2 - |
| 64 Cr | 24 | 40 | 63,96441 | 43 ms | 0+ |
| 65 Cr | 24 | 41 | 64.97016 | 27 ms | 1/2 - |
| 66 Cr | 24 | 42 | 65.97338 | 10 ms | 0+ |
| 67 Cr | 24 | 43 | 66,97955 | 10 ms | 1/2 - |
| 68 Cr | 24 | 44 | > 360 ns | ||
Notes
- ↑ Development of technology for creating a neutrino source based on the Cr-51 isotope
- ↑ Data shown for Audi G. , Wapstra AH , Thibault C. The AME2003 atomic mass evaluation (II). Tables, graphs, and references (Eng.) // Nuclear Physics A. - 2003. - Vol. 729 . - P. 337–676 . - DOI : 10.1016 / j.nuclphysa.2003.11.003 . - .
- ↑ 1 2 Data are given for Audi G. , Bersillon O. , Blachot J. , Wapstra AH The NUBASE evaluation of nuclear and decay properties // Nuclear Physics A. - 2003 .-- T. 729 . - S. 3—128 . - DOI : 10.1016 / j.nuclphysa.2003.11.001 . - .
Periodic table on isotopes of elements. Isotopes.
| one H | 2 He | ||||||||||||||||
| 3 Li | four Be | 5 B | 6 C | 7 N | 8 O | 9 F | 10 Ne | ||||||||||
| eleven Na | 12 Mg | 13 Al | fourteen Si | fifteen P | 16 S | 17 Cl | eighteen Ar | ||||||||||
| 19 K | twenty Ca | 21 Sc | 22 Ti | 23 V | 24 Cr | 25 Mn | 26 Fe | 27 Co | 28 Ni | 29th Cu | thirty Zn | 31 Ga | 32 Ge | 33 As | 34 Se | 35 Br | 36 Kr |
| 37 Rb | 38 Sr | 39 Y | 40 Zr | 41 Nb | 42 Mo | 43 Tc | 44 Ru | 45 Rh | 46 Pd | 47 Ag | 48 Cd | 49 In | fifty Sn | 51 Sb | 52 Te | 53 I | 54 Xe |
| 55 Cs | 56 Ba | * | 72 Hf | 73 Ta | 74 W | 75 Re | 76 Os | 77 Ir | 78 Pt | 79 Au | 80 Hg | 81 Tl | 82 Pb | 83 Bi | 84 Po | 85 At | 86 Rn |
| 87 Fr | 88 Ra | ** | 104 Rf | 105 Db | 106 Sg | 107 Bh | 108 Hs | 109 Mt | 110 Ds | 111 Rg | 112 Cn | 113 Nh | 114 Fl | 115 Mc | 116 Lv | 117 Ts | 118 Og |
| * | 57 La | 58 Ce | 59 Pr | 60 Nd | 61 Pm | 62 Sm | 63 Eu | 64 Gd | 65 Tb | 66 Dy | 67 Ho | 68 Er | 69 Tm | 70 Yb | 71 Lu |
| ** | 89 Ac | 90 Th | 91 Pa | 92 U | 93 Np | 94 Pu | 95 Am | 96 Cm | 97 Bk | 98 Cf | 99 Es | one hundred Fm | 101 Md | 102 No | 103 Lr |