Potassium-49
Properties and data of the isotope 49K.
See also: list of Potassium isotopes.
General data
Name of the isotope:Potassium-49; K-49Symbol:49K or 4919KMass number A:49 (= number of nucleons)Atomic number Z:19 (= number of protons)Neutrons N:30Isotopic mass:48.9682108(9) u (atomic weight of Potassium-49)Nuclide mass:48.957788 u (calculated nuclear mass without electrons)Mass excess:-29.61145 MeVMass defect:0.440412288 u (per nucleus)Nuclear binding energy:410.2414038 MeV (per nucleus)
8.37227355 MeV (average binding energy per nucleon)Separation energy:SN = 5.3983(11) MeV (first neutron)
SP = 14.62(31) MeV (first proton)Half-life:1.26(5) sDecay constant λ:0.55011680996821 s-1Specific activity α:6.901835248015 × 10+21 Bq g-1
186536087784.21 Ci g-1Spin and parity:
(nuclear angular momentum)(1/2+.3/2+)Magnetic dipole moment:μ(μN) = +1.3386(8)Year of discovery:1972
Radioactive Decay
Half-life T½ = 1.26(5) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 49Ca | 14(9) % | 11.6883(8) MeV | |
β-, n | 48Ca | 86(9) % | 6.5418(8) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 49) with Potassium-49. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 30 | Isobar A = 49 |
13 | 43Al | |
14 | 44Si | |
15 | 45P | |
16 | 46S | 49S |
17 | 47Cl | 49Cl |
18 | 48Ar | 49Ar |
19 | 49K | 49K |
20 | 50Ca | 49Ca |
21 | 51Sc | 49Sc |
22 | 52Ti | 49Ti |
23 | 53V | 49V |
24 | 54Cr | 49Cr |
25 | 55Mn | 49Mn |
26 | 56Fe | 49Fe |
27 | 57Co | 49Co |
28 | 58Ni | 49Ni |
29 | 59Cu | |
30 | 60Zn | |
31 | 61Ga | |
32 | 62Ge | |
33 | 63As | |
34 | 64Se | |
External data and identifiers
Last update: 2020-10-12
Perma link: https://www.chemlin.org/isotope/potassium-49
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