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Chromium-50

Properties and data of the isotope 50Cr.


Content

See also: list of Chromium isotopes.

 

General data

Name of the isotope:Chromium-50; Cr-50Symbol:50Cr or 5024CrMass number A:50 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:26Isotopic mass:49.9460414(5) u (atomic weight of Chromium-50)Nuclide mass:49.9328758 u (calculated nuclear mass without electrons)Mass excess:-50.26211 MeVMass defect:0.467047184 u (per nucleus)Nuclear binding energy:435.05164961 MeV (per nucleus)
8.70103299 MeV (average binding energy per nucleon)
Separation energy:SN = 13.0003(22) MeV (first neutron)
SP = 8.5891(9) MeV (first proton)
Half-life:1.3 × 1018 aDecay constant λ:1.690726591116 × 10-26 s-1Specific activity α:0.00020779170790496 Bq g-1
5.615992105539 × 10-15 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Isobaric spin: 1Charge radius:3.6588(65) femtometer fmMirror nucleus:Iron-50Year of discovery:1930

 

Radioactive Decay

Half-life T½ = 1.3 × 1018 a respectively 4.0997 × 1025 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
2 EE ?

 

Parent Nuclides

Direct parent isotopes are: 50Mn, 50V.

 

Occurrence

Comparison of the natural Chromium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Chromium
Isotopic mixture
51.9961 u100 %
Isotope 50Cr49.9460414(5) u4.345(13) %1.3 × 1018 a0+
Isotope 52Cr51.940506(4) u83.789(18) %stable0+
Isotope 53Cr52.940648(4) u9.501(17) %stable3/2-
Isotope 54Cr53.938879(4) u2.365(7) %stable0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 50) with Chromium-50. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 26Isobar A = 50
1137Na
1238Mg
1339Al
1440Si
1541P
1642S
1743Cl50Cl
1844Ar50Ar
1945K50K
2046Ca50Ca
2147Sc50Sc
2248Ti50Ti
2349V50V
2450Cr50Cr
2551Mn50Mn
2652Fe50Fe
2753Co50Co
2854Ni50Ni
2955Cu
3056Zn

 

External data and identifiers

Adopted Levels, Gammas:NuDat 50Cr

 


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Last update: 2023-10-04


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