Chromium-56

Properties and data of the isotope ⁵⁶Cr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Chromium isotopes (and general data sources).

General data

Name of the isotope:Chromium-56; Cr-56Symbol:⁵⁶Cr or 5624CrMass number A:56 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:32Isotopic mass:55.9406491(6) u (atomic weight of Chromium-56)Nuclide mass:55.9274835 u (calculated nuclear mass without electrons)Mass excess:-55.28501 MeVMass defect:0.52442898 u (per nucleus)Nuclear binding energy:488.5024483 MeV (per nucleus)
8.72325801 MeV (average binding energy per nucleon)Separation energy:S_N = 8.2466(6) MeV (first neutron)
S_P = 13.43(10) MeV (first proton)Half-life:5.94(10) minDecay constant λ:0.0019448574089785 s^-1Specific activity α:2.129491867156 × 10⁺¹⁹ Bq g^-1
575538342.4747 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1960

Radioactive Decay

Half-life T_½ = 5.94(10) min (minutes) respectively 3.564 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁵⁶Mn	100 %	1.6265(6) MeV

Parent Nuclides

Direct parent isotope is: ⁵⁶V.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 32) and isobaric (same nucleon number A = 56) with Chromium-56. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 32	Isobar A = 56
16	⁴⁸S
17	⁴⁹Cl
18	⁵⁰Ar
19	⁵¹K	⁵⁶K
20	⁵²Ca	⁵⁶Ca
21	⁵³Sc	⁵⁶Sc
22	⁵⁴Ti	⁵⁶Ti
23	⁵⁵V	⁵⁶V
24	⁵⁶Cr	⁵⁶Cr
25	⁵⁷Mn	⁵⁶Mn
26	⁵⁸Fe	⁵⁶Fe
27	⁵⁹Co	⁵⁶Co
28	⁶⁰Ni	⁵⁶Ni
29	⁶¹Cu	⁵⁶Cu
30	⁶²Zn	⁵⁶Zn
31	⁶³Ga
32	⁶⁴Ge
33	⁶⁵As
34	⁶⁶Se
35	⁶⁷Br
36	⁶⁸Kr