Magnesium-33

Properties and data of the isotope ³³Mg.

Contents

General data

Name of the isotope:Magnesium-33; Mg-33Symbol:³³Mg or 3312MgMass number A:33 (= number of nucleons)Atomic number Z:12 (= number of protons)Neutrons N:21Isotopic mass:33.005327(3) u (atomic weight of Magnesium-33)Nuclide mass:32.9987441 u (calculated nuclear mass without electrons)Mass excess:4.96207 MeVMass defect:0.27053662 u (per nucleus)Nuclear binding energy:252.00323831 MeV (per nucleus)
7.63646177 MeV (average binding energy per nucleon)Separation energy:S_N = 2.280(4) MeV (first neutron)
S_P = 20.97(4) MeV (first proton)Half-life:90.5(16) msDecay constant λ:7.6590848680657 s^-1Specific activity α:1.397699634354 × 10⁺²³ Bq g^-1
3777566579336.8 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μ_N) = - 0.7455(5)Nuclear g-factor:g_l = -0.497Year of discovery:1979

Radioactive Decay

Half-life T_½ = 90.5(16) ms respectively 9.05 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	³³Al	86(2) %	13.38438 MeV
β^-, n	³²Al	14(2) %	7.93781 MeV

Parent Nuclides

Direct parent isotopes are: ³³Na, ³⁴Na.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 21) and isobaric (same nucleon number A = 33) with Magnesium-33. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 21	Isobar A = 33
9	³⁰F
10	³¹Ne	³³Ne
11	³²Na	³³Na
12	³³Mg	³³Mg
13	³⁴Al	³³Al
14	³⁵Si	³³Si
15	³⁶P	³³P
16	³⁷S	³³S
17	³⁸Cl	³³Cl
18	³⁹Ar	³³Ar
19	⁴⁰K	³³K
20	⁴¹Ca
21	⁴²Sc
22	⁴³Ti
23	⁴⁴V
24	⁴⁵Cr
25	⁴⁶Mn
26	⁴⁷Fe
27	⁴⁸Co
28	⁴⁹Ni