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Magnesium-28

Properties and data of the isotope 28Mg.


Content

See also: list of Magnesium isotopes.

 

General data

Name of the isotope:Magnesium-28; Mg-28Symbol:28Mg or 2812MgMass number A:28 (= number of nucleons)Atomic number Z:12 (= number of protons)Neutrons N:16Isotopic mass:27.9838766(21) u (atomic weight of Magnesium-28)Nuclide mass:27.9772937 u (calculated nuclear mass without electrons)Mass excess:-15.01885 MeVMass defect:0.24866244 u (per nucleus)Nuclear binding energy:231.62757089 MeV (per nucleus)
8.27241325 MeV (average binding energy per nucleon)
Separation energy:SN = 8.5035(20) MeV (first neutron)
SP = 16.790(4) MeV (first proton)
Half-life:20.915(9) hDecay constant λ:9.20587537599 × 10-6 s-1Specific activity α:2.053299194564 × 10+17 Bq g-1
5549457.2826073 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Charge radius:0 femtometer fmMirror nucleus:Sulfur-28Year of discovery:1953

 

Radioactive Decay

Half-life T½ = 20.915(9) h (hours) respectively 7.5294 × 104 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-28Al100 %1.8318(20) MeV

 

Parent Nuclides

Direct parent isotopes are: 28Na, 29Na.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 16) and isobaric (same nucleon number A = 28) with Magnesium-28. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 16Isobar A = 28
521B
622C
723N
824O28O
925F28F
1026Ne28Ne
1127Na28Na
1228Mg28Mg
1329Al28Al
1430Si28Si
1531P28P
1632S28S
1733Cl28Cl
1834Ar
1935K
2036Ca
2137Sc
2238Ti

 

External data and identifiers

Adopted Levels, Gammas:NuDat 28Mg

 


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Last update: 2023-10-04


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