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Magnesium Magnesium is a chemical element; it has Symbol (chemistry), symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 ...
(12Mg) naturally occurs in three stable isotopes: , , and . There are 19 radioisotopes that have been discovered, ranging from to (with the exception of ). The longest-lived radioisotope is with a half-life of . The lighter isotopes mostly decay to isotopes of
sodium Sodium is a chemical element; it has Symbol (chemistry), symbol Na (from Neo-Latin ) and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 element, group 1 of the peri ...
while the heavier isotopes decay to isotopes of
aluminium Aluminium (or aluminum in North American English) is a chemical element; it has chemical symbol, symbol Al and atomic number 13. It has a density lower than that of other common metals, about one-third that of steel. Aluminium has ...
. The shortest-lived is proton-unbound with a half-life of . A precise measurement of the neutron-rich 40Mg in 2019 showed the unexpected difference in its nuclear structure, compared to the lighter neighboring isotopes.


List of isotopes

, -id=Magnesium-18 , , style="text-align:right" , 12 , style="text-align:right" , 6 , , , 2p , , 0+ , , , -id=Magnesium-19 , , style="text-align:right" , 12 , style="text-align:right" , 7 , , , 2p , , 1/2−# , , , - , rowspan=2, , rowspan=2 style="text-align:right" , 12 , rowspan=2 style="text-align:right" , 8 , rowspan=2, , rowspan=2, , β+ () , , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , β+p () , , - , rowspan=4, , rowspan=4 style="text-align:right" , 12 , rowspan=4 style="text-align:right" , 9 , rowspan=4, , rowspan=4, , β+ () , , rowspan=4, 5/2+ , rowspan=4, , rowspan=4, , - , β+p () , , - , β+α () , , - , β+pα () , , - , , style="text-align:right" , 12 , style="text-align:right" , 10 , , , β+ , , 0+ , , , - , , style="text-align:right" , 12 , style="text-align:right" , 11 , , , β+ , , 3/2+ , , , - , , style="text-align:right" , 12 , style="text-align:right" , 12 , , colspan=3 align=center, Stable , 0+ , colspan=2 align=center,  , - , , style="text-align:right" , 12 , style="text-align:right" , 13 , , colspan=3 align=center, Stable , 5/2+ , colspan=2 align=center,  , - , Used in
radiodating Radiometric dating, radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed. The method compares t ...
events early in the Solar System's history
, style="text-align:right" , 12 , style="text-align:right" , 14 , , colspan=3 align=center, Stable , 0+ , colspan=2 align=center,  , - , , style="text-align:right" , 12 , style="text-align:right" , 15 , , , β , , 1/2+ , , , - , , style="text-align:right" , 12 , style="text-align:right" , 16 , , , β , , 0+ , , , - , , style="text-align:right" , 12 , style="text-align:right" , 17 , , , β , , 3/2+ , , , - , rowspan=2, , rowspan=2 style="text-align:right" , 12 , rowspan=2 style="text-align:right" , 18 , rowspan=2, , rowspan=2, , β (> ) , , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , βn (< ) , , - , rowspan=2, , rowspan=2 style="text-align:right" , 12 , rowspan=2 style="text-align:right" , 19 , rowspan=2, , rowspan=2, , β () , , rowspan=2, 1/2+ , rowspan=2, , rowspan=2, , - , βn () , , - , rowspan=2, , rowspan=2 style="text-align:right" , 12 , rowspan=2 style="text-align:right" , 20 , rowspan=2, , rowspan=2, , β () , , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , βn () , , - , rowspan=3, , rowspan=3 style="text-align:right" , 12 , rowspan=3 style="text-align:right" , 21 , rowspan=3, , rowspan=3, , β () , , rowspan=3, 3/2− , rowspan=3, , rowspan=3, , - , βn () , , - , β2n ?Decay mode shown is energetically allowed, but has not been experimentally observed to occur in this nuclide. , ? , - , rowspan=3, , rowspan=3 style="text-align:right" , 12 , rowspan=3 style="text-align:right" , 22 , rowspan=3, , rowspan=3, , β (> ) , , rowspan=3, 0+ , rowspan=3, , rowspan=3, , - , βn () , , - , β2n (< ) , , - , rowspan=3, , rowspan=3 style="text-align:right" , 12 , rowspan=3 style="text-align:right" , 23 , rowspan=3, , rowspan=3, , βn () , , rowspan=3, (3/2−, 5/2−) , rowspan=3, , rowspan=3, , - , β () , , - , β2n ? , ? , - , rowspan=3, , rowspan=3 style="text-align:right" , 12 , rowspan=3 style="text-align:right" , 24 , rowspan=3, , rowspan=3, , β () , , rowspan=3, 0+ , rowspan=3, , rowspan=3, , - , βn () , , - , β2n ? , ? , - , rowspan=3, , rowspan=3 style="text-align:right" , 12 , rowspan=3 style="text-align:right" , 25 , rowspan=3, , rowspan=3, , β ? , ? , rowspan=3, (3/2−) , rowspan=3, , rowspan=3, , - , βn ? , ? , - , β2n ? , ? , - , rowspan=3, , rowspan=3 style="text-align:right" , 12 , rowspan=3 style="text-align:right" , 26 , rowspan=3, # , rowspan=3, 3.1(4 ( stat), 2 ( sys)) ms , βn (81%) , , rowspan=3, 0+ , rowspan=3, , rowspan=3, , - , β (9%) , , - , β2n (9%) , , - , rowspan=3, , rowspan=3 style="text-align:right" , 12 , rowspan=3 style="text-align:right" , 28 , rowspan=3, # , rowspan=3, 1# ms , β ? , ? , rowspan=3, 0+ , rowspan=3, , rowspan=3, , - , βn ? , ? , - , β2n ? , ? , -


External links


Magnesium isotopes data from ''The Berkeley Laboratory Isotopes Project's''


See also

Daughter products other than magnesium *
Isotopes of aluminum Aluminium or ''aluminum'' (13Al) has 23 known isotopes from 21Al to 43Al and 4 known isomers. Only 27Al (stable isotope) and 26Al (radioactive isotope, t1/2 = ) occur naturally, however 27Al comprises nearly all natural aluminium. Other than 26 ...
*
Isotopes of sodium There are 20 isotopes of sodium (11Na), ranging from to (except for the still-unknown 36Na and 38Na), and five isomers (two for , and one each for , , and ). is the only stable (and the only primordial) isotope. It is considered a monoisotopi ...
*
Isotopes of neon Neon (10Ne) possesses three stable isotopes: , , and . In addition, 17 radioactive isotopes have been discovered, ranging from to , all short-lived. The longest-lived is with a half-life of . All others are under a minute, most under a second. ...
*
Isotopes of fluorine Fluorine (9F) has 19 known isotopes ranging from to and two isomers ( and ). Only fluorine-19 is stable and naturally occurring in more than trace quantities; therefore, fluorine is a monoisotopic and mononuclidic element. The longest-lived r ...
*
Isotopes of oxygen There are three known stable isotopes of oxygen (8O): , , and . Radioactive isotopes ranging from to have also been characterized, all short-lived. The longest-lived radioisotope is with a half-life of , while the shortest-lived isotope i ...


References

{{Navbox element isotopes Magnesium
Magnesium Magnesium is a chemical element; it has Symbol (chemistry), symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 ...