Magnesium-25

Properties and data of the isotope ²⁵Mg.

Content

General data

Name of the isotope:Magnesium-25; Mg-25Symbol:²⁵Mg or 2512MgMass number A:25 (= number of nucleons)Atomic number Z:12 (= number of protons)Neutrons N:13Isotopic mass:24.9858370(3) u (atomic weight of Magnesium-25)Nuclide mass:24.9792541 u (calculated nuclear mass without electrons)Mass excess:-13.19275 MeVMass defect:0.220707292 u (per nucleus)Nuclear binding energy:205.58751825 MeV (per nucleus)
8.22350073 MeV (average binding energy per nucleon)Separation energy:S_N = 7.33053(5) MeV (first neutron)
S_P = 12.06385(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = -0.85533(3)Charge radius:3.0284(22) femtometer fmMirror nucleus:Aluminium-25Year of discovery:1920

Parent Nuclides

Direct parent isotopes are: ²⁵Al, ²⁵Na.

Occurrence

Comparison of the natural Magnesium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Magnesium Isotopic mixture	24.305 u	100 %
Isotope ²⁴Mg	23.98504170(9) u	78.965 % [78.88 - 79.05 %]	stable	0+
Isotope ²⁵Mg	24.9858370(3) u	10.011 % [9.988 - 10.034 %]	stable	5/2+
Isotope ²⁶Mg	25.9825930(2) u	11.024 % [10.96 - 11.09 %]	stable	0+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ²⁵Mg

Isotope:²⁵Mg-NMRQuantity:10.011 % [9.988 - 10.034 %]Spin:5/2+Nuclearmagnetic moment
μ/μ_N:-0.85533(3)Gyromagnetic ratio γ:- 1.639 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = -0.342132Quadrupole moment Q:+ 0.1994(20) barn (100 fm²)Resonance frequency:v₀ = 2.6083 at 1 TRelative Sensitivity:0.002698 (H₀ = const.)
0.7147 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 13) and isobaric (same nucleon number A = 25) with Magnesium-25. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 13	Isobar A = 25
5	¹⁸B
6	¹⁹C
7	²⁰N	²⁵N
8	²¹O	²⁵O
9	²²F	²⁵F
10	²³Ne	²⁵Ne
11	²⁴Na	²⁵Na
12	²⁵Mg	²⁵Mg
13	²⁶Al	²⁵Al
14	²⁷Si	²⁵Si
15	²⁸P	²⁵P
16	²⁹S
17	³⁰Cl
18	³¹Ar
19	³²K