Sodium-25
Properties and data of the isotope 25Na.
Sodium-25 is a radioisotope of the chemical element sodium, which, in addition to the element-specific 11 protons, has 14 neutrons in the atomic nucleus, resulting in the mass number 25. The very short-lived, unstable and therefore radioactive nuclide, which can only be produced artificially, has no practical significance; The study of 25Na serves exclusively academic purposes.
See also: list of Sodium isotopes.
General data
Name of the isotope:Sodium-25; Na-25Symbol:25Na or 2511NaMass number A:25 (= number of nucleons)Atomic number Z:11 (= number of protons)Neutrons N:14Isotopic mass:24.9899540(13) u (atomic weight of Sodium-25)Nuclide mass:24.9839197 u (calculated nuclear mass without electrons)Mass excess:-9.35779 MeVMass defect:0.217430176 u (per nucleus)Nuclear binding energy:202.53490436 MeV (per nucleus)
8.10139617 MeV (average binding energy per nucleon)Separation energy:SN = 9.0112(12) MeV (first neutron)
SP = 10.6951(13) MeV (first proton)Half-life:59.1(6) sDecay constant λ:0.011728378689678 s-1Specific activity α:2.942914521996 × 10+20 Bq g-1
7953823032.4232 Ci g-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = +3.683(4)Quadrupole moment Q:- 0.10(5) barn (100 fm2)Nuclear g-factor:gl = 1.4732Charge radius:2.9769(252) femtometer fmMirror nucleus:Silicon-25Year of discovery:1943
Radioactive Decay
Half-life T½ = 59.1(6) s respectively 5.91 × 101 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 25Mg | 100 % | 3.8350(12) MeV | |
Parent Nuclides
Direct parent isotope is: 25Ne.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 14) and isobaric (same nucleon number A = 25) with Sodium-25. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 14 | Isobar A = 25 |
|---|
| 5 | 19B | |
| 6 | 20C | |
| 7 | 21N | 25N |
| 8 | 22O | 25O |
| 9 | 23F | 25F |
| 10 | 24Ne | 25Ne |
| 11 | 25Na | 25Na |
| 12 | 26Mg | 25Mg |
| 13 | 27Al | 25Al |
| 14 | 28Si | 25Si |
| 15 | 29P | 25P |
| 16 | 30S | |
| 17 | 31Cl | |
| 18 | 32Ar | |
| 19 | 33K | |
| 20 | 34Ca | |
External data and identifiers
Last update: 2023-11-05
Perma link: https://www.chemlin.org/isotope/sodium-25
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