Phosphorus-33
Properties and data of the isotope 33P.
See also: list of Phosphorus isotopes.
General data
Name of the isotope:Phosphorus-33; P-33Symbol:33P or 3315PMass number A:33 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:18Isotopic mass:32.9717257(12) u (atomic weight of Phosphorus-33)Nuclide mass:32.9634971 u (calculated nuclear mass without electrons)Mass excess:-26.33734 MeVMass defect:0.30161826800001 u (per nucleus)Nuclear binding energy:280.95560693 MeV (per nucleus)
8.51380627 MeV (average binding energy per nucleon)Separation energy:SN = 10.1038(11) MeV (first neutron)
SP = 9.5486(11) MeV (first proton)Half-life:25.35(11) dDecay constant λ:3.164708801592 × 10-7 s-1Specific activity α:5.955725682459 × 10+15 Bq g-1
160965.55898539 Ci g-1Spin and parity:
(nuclear angular momentum)1/2+Mirror nucleus:Argon-33Year of discovery:1951
Radioactive Decay
Half-life T½ = 25.35(11) d respectively 2.190240 × 106 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 33S | 100 % | 0.2485(11) MeV | |
Parent Nuclides
Direct parent isotope is: 33Si.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 18) and isobaric (same nucleon number A = 33) with Phosphorus-33. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 18 | Isobar A = 33 |
7 | 25N | |
8 | 26O | |
9 | 27F | |
10 | 28Ne | 33Ne |
11 | 29Na | 33Na |
12 | 30Mg | 33Mg |
13 | 31Al | 33Al |
14 | 32Si | 33Si |
15 | 33P | 33P |
16 | 34S | 33S |
17 | 35Cl | 33Cl |
18 | 36Ar | 33Ar |
19 | 37K | 33K |
20 | 38Ca | |
21 | 39Sc | |
22 | 40Ti | |
23 | 41V | |
24 | 42Cr | |
25 | 43Mn | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/phosphorus-33
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