Phosphorus-28
Properties and data of the isotope 28P.
See also: list of Phosphorus isotopes.
General data
Name of the isotope:Phosphorus-28; P-28Symbol:28P or 2815PMass number A:28 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:13Isotopic mass:27.9923266(12) u (atomic weight of Phosphorus-28)Nuclide mass:27.984098 u (calculated nuclear mass without electrons)Mass excess:-7.14773 MeVMass defect:0.237692788 u (per nucleus)Nuclear binding energy:221.40940587 MeV (per nucleus)
7.90747878 MeV (average binding energy per nucleon)Separation energy:SN = 14.497(26) MeV (first neutron)
SP = 2.0522(12) MeV (first proton)Half-life:270.3(5) msDecay constant λ:2.5643624881981 s-1Specific activity α:5.71961189624 × 10+22 Bq g-1
1545841053039.7 Ci g-1Spin and parity:
(nuclear angular momentum)3+Magnetic dipole moment:μ(μN) = 0.312(3)Nuclear g-factor:gl = 0.104Mirror nucleus:Aluminium-28Year of discovery:1953
Radioactive Decay
Half-life T½ = 270.3(5) ms respectively 2.703 × 10-1 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 28Si | 99.998 % | 14.34374 MeV | |
ε, p | 27Al | 0.0013 % | 2.749 MeV | |
ε, α | 24Mg | 0.00086 % | 4,350 MeV | |
Parent Nuclides
Direct parent isotope is: 28S.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 13) and isobaric (same nucleon number A = 28) with Phosphorus-28. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 13 | Isobar A = 28 |
5 | 18B | |
6 | 19C | |
7 | 20N | |
8 | 21O | 28O |
9 | 22F | 28F |
10 | 23Ne | 28Ne |
11 | 24Na | 28Na |
12 | 25Mg | 28Mg |
13 | 26Al | 28Al |
14 | 27Si | 28Si |
15 | 28P | 28P |
16 | 29S | 28S |
17 | 30Cl | 28Cl |
18 | 31Ar | |
19 | 32K | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/phosphorus-28
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