Magnesium-19

Properties and data of the isotope ¹⁹Mg.

Contents

Magnesium-19 is a radioisotope of the chemical element magnesium, which has 7 neutrons in its atomic nucleus in addition to the element-specific 12 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 19. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ¹⁹Mg is exclusively for academic purposes.

The first observation of the proton-rich isotope was first reported in 2007 [1].

General data

Name of the isotope:Magnesium-19; Mg-19Symbol:¹⁹Mg or 1912MgMass number A:19 (= number of nucleons)Atomic number Z:12 (= number of protons)Neutrons N:7Isotopic mass:19.034180(60) u (atomic weight of Magnesium-19)Nuclide mass:19.0275971 u (calculated nuclear mass without electrons)Mass excess:31.83846 MeVMass defect:0.120374796 u (per nucleus)Nuclear binding energy:112.12840023 MeV (per nucleus)
5.90149475 MeV (average binding energy per nucleon)Separation energy:
S_P = 0.489(111) MeV (first proton)Half-life:5(3) psDecay constant λ:138629436111.99 s^-1Specific activity α:4.393926271578 × 10⁺³³ Bq g^-1
1.187547640967 × 10⁺²³ Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Mirror nucleus:Nitrogen-19Year of discovery:2007

Radioactive Decay

Half-life T_½ = 5(3) ps respectively 5 × 10^-12 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2p	¹⁷Ne	100 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 7) and isobaric (same nucleon number A = 19) with Magnesium-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.