Potassium-42
Properties and data of the isotope 42K.
See also: list of Potassium isotopes.
General data
Name of the isotope:Potassium-42; K-42Other names:RadiokaliumSymbol:42K or 4219KMass number A:42 (= number of nucleons)Atomic number Z:19 (= number of protons)Neutrons N:23Isotopic mass:41.96240231(11) u (atomic weight of Potassium-42)Nuclide mass:41.9519795 u (calculated nuclear mass without electrons)Mass excess:-35.02202 MeVMass defect:0.385566366 u (per nucleus)Nuclear binding energy:359.15275653 MeV (per nucleus)
8.55125611 MeV (average binding energy per nucleon)Separation energy:SN = 7.53380(11) MeV (first neutron)
SP = 9.2435(4) MeV (first proton)Half-life:12.355(7) hDecay constant λ:1.560931361887 × 10-5 s-1Specific activity α:2.292719154629 × 10+17 Bq g-1
6196538.2557559 Ci g-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μN) = - 1.1425(6)Nuclear g-factor:gl = -0.57125Charge radius:3.4517(70) femtometer fmMirror nucleus:Vanadium-42Year of discovery:1935
Radioactive Decay
Half-life T½ = 12.355(7) h (hours) respectively 4.4406 × 104 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 42Ca | 100 % | 3.52522(18) MeV | |
Parent Nuclides
Direct parent isotope is: 42Ar.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 23) and isobaric (same nucleon number A = 42) with Potassium-42. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 23 | Isobar A = 42 |
10 | 33Ne | |
11 | 34Na | |
12 | 35Mg | |
13 | 36Al | 42Al |
14 | 37Si | 42Si |
15 | 38P | 42P |
16 | 39S | 42S |
17 | 40Cl | 42Cl |
18 | 41Ar | 42Ar |
19 | 42K | 42K |
20 | 43Ca | 42Ca |
21 | 44Sc | 42Sc |
22 | 45Ti | 42Ti |
23 | 46V | 42V |
24 | 47Cr | 42Cr |
25 | 48Mn | 42Mn |
26 | 49Fe | |
27 | 50Co | |
28 | 51Ni | |
External data and identifiers
CAS:14378-21-3InChI Key:ZLMJMSJWJFRBEC-AKLPVKDBSA-NSMILES:[42K]PubChem:ID 11607897Adopted Levels, Gammas:NuDat 42K
Literature and References
[1] - G. Hevesy, Hilde Levi:
Radiopotassium and other Artificial Radio-elements.
In: Nature, (1935), DOI 10.1038/135580a0.
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/potassium-42
© 1996 - 2024 ChemLin