Aluminium-25
Properties and data of the isotope 25Al.
See also: list of Aluminium isotopes.
General data
Name of the isotope:Aluminium-25; Al-25Symbol:25Al or 2513AlMass number A:25 (= number of nucleons)Atomic number Z:13 (= number of protons)Neutrons N:12Isotopic mass:24.99042831(7) u (atomic weight of Aluminium-25)Nuclide mass:24.9832968 u (calculated nuclear mass without electrons)Mass excess:-8.91597 MeVMass defect:0.215276098 u (per nucleus)Nuclear binding energy:200.52839363 MeV (per nucleus)
8.02113575 MeV (average binding energy per nucleon)Separation energy:SN = 16.93843(24) MeV (first neutron)
SP = 2.27138(7) MeV (first proton)Half-life:7.183(12) sDecay constant λ:0.096498284917158 s-1Specific activity α:2.421359435472 × 10+21 Bq g-1
65442146904.665 Ci g-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = 3.6447(12)Nuclear g-factor:gl = 1.45788Mirror nucleus:Magnesium-25Year of discovery:1953
Radioactive Decay
Half-life T½ = 7.183(12) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EE/β+ | 25Mg | 100 % | 4.27681(8) MeV | |
Parent Nuclides
Direct parent isotopes are: 25Si, 26P, 27S.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 12) and isobaric (same nucleon number A = 25) with Aluminium-25. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 12 | Isobar A = 25 |
4 | 16Be | |
5 | 17B | |
6 | 18C | |
7 | 19N | 25N |
8 | 20O | 25O |
9 | 21F | 25F |
10 | 22Ne | 25Ne |
11 | 23Na | 25Na |
12 | 24Mg | 25Mg |
13 | 25Al | 25Al |
14 | 26Si | 25Si |
15 | 27P | 25P |
16 | 28S | |
17 | 29Cl | |
18 | 30Ar | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/aluminium-25
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