Potassium-54

Properties and data of the isotope ⁵⁴K.

Content

General data

Name of the isotope:Potassium-54; K-54Symbol:⁵⁴K or 5419KMass number A:54 (= number of nucleons)Atomic number Z:19 (= number of protons)Neutrons N:35Isotopic mass:53.99463(64) u (atomic weight of Potassium-54)Nuclide mass:53.9842072 u (calculated nuclear mass without electrons)Mass excess:-5.00212 MeVMass defect:0.457317668 u (per nucleus)Nuclear binding energy:425.98866384 MeV (per nucleus)
7.88867896 MeV (average binding energy per nucleon)Separation energy:S_N = 0.78(61) MeV (first neutron)
S_P = 18.08(92) MeV (first proton)Half-life:10(5) msDecay constant λ:69.314718055995 s^-1Specific activity α:7.875905581132 × 10⁺²³ Bq g^-1
21286231300357 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Year of discovery:1983

Radioactive Decay

Half-life T_½ = 10(5) ms respectively 1 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁵⁴Ca	< 100 %	20.16(60) MeV
β^-, n	⁵³Ca	> 0 %	16.31(60) MeV
β^-, 2n	⁵²Ca	> 0 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 54) with Potassium-54. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 35	Isobar A = 54
18	⁵³Ar
19	⁵⁴K	⁵⁴K
20	⁵⁵Ca	⁵⁴Ca
21	⁵⁶Sc	⁵⁴Sc
22	⁵⁷Ti	⁵⁴Ti
23	⁵⁸V	⁵⁴V
24	⁵⁹Cr	⁵⁴Cr
25	⁶⁰Mn	⁵⁴Mn
26	⁶¹Fe	⁵⁴Fe
27	⁶²Co	⁵⁴Co
28	⁶³Ni	⁵⁴Ni
29	⁶⁴Cu	⁵⁴Cu
30	⁶⁵Zn	⁵⁴Zn
31	⁶⁶Ga
32	⁶⁷Ge
33	⁶⁸As
34	⁶⁹Se
35	⁷⁰Br
36	⁷¹Kr
37	⁷²Rb
38	⁷³Sr