Chromium-45
Properties and data of the isotope 45Cr.
See also: list of Chromium isotopes.
General data
Name of the isotope:Chromium-45; Cr-45Symbol:45Cr or 4524CrMass number A:45 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:21Isotopic mass:44.97905(4) u (atomic weight of Chromium-45)Nuclide mass:44.9658844 u (calculated nuclear mass without electrons)Mass excess:-19.5148 MeVMass defect:0.390714004 u (per nucleus)Nuclear binding energy:363.94775044 MeV (per nucleus)
8.08772779 MeV (average binding energy per nucleon)Separation energy:SN = 14.23(30) MeV (first neutron)
SP = 2.69(19) MeV (first proton)Half-life:60.9(4) msDecay constant λ:11.381727102791 s-1Specific activity α:1.557780996417 × 10+23 Bq g-1
4210218909236.2 Ci g-1Spin and parity:
(nuclear angular momentum)(7/2-)Isobaric spin: 3/2Mirror nucleus:Scandium-45Year of discovery:1974
Radioactive Decay
Half-life T½ = 60.9(4) ms respectively 6.09 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β+ | 45V | 65.6 % | 12.47(49) MeV | |
β+, p | 44Ti | 34.4 % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
45mCr | 50 | 0.001 s~ | 3/2+~ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 21) and isobaric (same nucleon number A = 45) with Chromium-45. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 21 | Isobar A = 45 |
9 | 30F | |
10 | 31Ne | |
11 | 32Na | |
12 | 33Mg | |
13 | 34Al | |
14 | 35Si | |
15 | 36P | 45P |
16 | 37S | 45S |
17 | 38Cl | 45Cl |
18 | 39Ar | 45Ar |
19 | 40K | 45K |
20 | 41Ca | 45Ca |
21 | 42Sc | 45Sc |
22 | 43Ti | 45Ti |
23 | 44V | 45V |
24 | 45Cr | 45Cr |
25 | 46Mn | 45Mn |
26 | 47Fe | 45Fe |
27 | 48Co | |
28 | 49Ni | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/chromium-45
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