Isotopes of magnesium

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Magnesium (Mg)
Standard atomic mass: 24.3050(6) u

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
19Mg 12 7 19.03547(27) 1/2-#
20Mg 12 8 20.018863(29) 90.8(24) ms 0+
21Mg 12 9 21.011713(18) 122(2) ms (5/2,3/2)+
22Mg 12 10 21.9995738(14) 3.8755(12) s 0+
23Mg 12 11 22.9941237(14) 11.317(11) s 3/2+
24Mg 12 12 23.985041700(14) STABLE 0+ 0.7899(4) 0.78958-0.79017
25Mg 12 13 24.98583692(3) STABLE 5/2+ 0.1000(1) 0.09996-0.10012
26Mg 12 14 25.982592929(30) STABLE 0+ 0.1101(3) 0.10987-0.11030
27Mg 12 15 26.98434059(5) 9.458(12) min 1/2+
28Mg 12 16 27.9838768(22) 20.915(9) h 0+
29Mg 12 17 28.988600(15) 1.30(12) s 3/2+
30Mg 12 18 29.990434(9) 335(17) ms 0+
31Mg 12 19 30.996546(13) 230(20) ms 3/2+
32Mg 12 20 31.998975(19) 86(5) ms 0+
33Mg 12 21 33.005254(21) 90.5(16) ms 7/2-#
34Mg 12 22 34.00946(25) 20(10) ms 0+
35Mg 12 23 35.01734(43)# 70(40) ms (7/2-)#
36Mg 12 24 36.02300(54)# 3.9(13) ms 0+
37Mg 12 25 37.03140(97)# 40# ms [>260 ns] 7/2-#
38Mg 12 26 38.03757(54)# 1# ms [>260 ns] 0+
39Mg 12 27 39.04677(55)# <260 ns 7/2-#
40Mg 12 28 40.05393(97)# 1# ms 0+

Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

External links


Isotopes of sodium Isotopes of magnesium Isotopes of aluminium
Index to isotope pages · Table of nuclides



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