Potassium-33

Properties and data of the isotope ³³K.

Content

General data

Name of the isotope:Potassium-33; K-33Symbol:³³K or 3319KMass number A:33 (= number of nucleons)Atomic number Z:19 (= number of protons)Neutrons N:14Isotopic mass:33.00756(21) u (atomic weight of Potassium-33)Nuclide mass:32.9971372 u (calculated nuclear mass without electrons)Mass excess:7.04209 MeVMass defect:0.262424432 u (per nucleus)Nuclear binding energy:244.44678386 MeV (per nucleus)
7.4074783 MeV (average binding energy per nucleon)Separation energy:S_N = 22.13(45) MeV (first neutron)Half-life:25 nsDecay constant λ:27725887.222398 s^-1Specific activity α:5.059672676363 × 10⁺²⁹ Bq g^-1
1.367479101719 × 10⁺¹⁹ Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Mirror nucleus:Silicon-33

Radioactive Decay

Half-life T_½ = 25 ns respectively 2.5 × 10^-8 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
p	³²Ar	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 14) and isobaric (same nucleon number A = 33) with Potassium-33. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 14	Isobar A = 33
5	¹⁹B
6	²⁰C
7	²¹N
8	²²O
9	²³F
10	²⁴Ne	³³Ne
11	²⁵Na	³³Na
12	²⁶Mg	³³Mg
13	²⁷Al	³³Al
14	²⁸Si	³³Si
15	²⁹P	³³P
16	³⁰S	³³S
17	³¹Cl	³³Cl
18	³²Ar	³³Ar
19	³³K	³³K
20	³⁴Ca