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Oxygen-18

Properties and data of the isotope 18O.

 

See also: list of Oxygen isotopes.

 

General data

Name of the isotope:Oxygen-18; O-18Symbol:18OMass number A:18Atomic number Z:8 (= number of protons)Neutrons N:10Isotopic mass:17.999159613(6) u (atomic weight of Oxygen-18)Nuclide mass:17.994771 u (calculated nuclear mass without electrons)Mass excess:-0.78282 MeVMass defect:0.150089803 u (per nucleus)Nuclear binding energy:139.80775096 MeV (per nucleus)
7.76709728 MeV (average binding energy per nucleon)
Separation energy:SN = 8.04537(0) MeV (first neutron)
SP = 15.942(15) MeV (first proton)
Half-life:stableSpin and parity:0+isobaric spin: 1Charge radius:2.7726(56) femtometer fmYear of discovery:1929

 

Parent Nuclides

Direct parent isotopes are: 18N, 18F.

 

Occurrence

Comparison of the natural Sauerstoff isotopes including isotopic abundance (proportion of the isotope mixture):

 

Atomic Mass maQuantityHalf-lifeSpin
Sauerstoff
Isotopic mixture
15,999 u100 %
Isotope 16O15,994914620(2) u99,757 %stable0+
Isotope 17O16,999131757(5) u0,0383 %stable5/2+
Isotope 18O17,999159613(6) u0,2045 %stable0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 10) and isobaric (same nucleon number A = 18) with Oxygen-18. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 10Isobar A = 18
414Be
515B18B
616C18C
717N18N
818O18O
919F18F
1020Ne18Ne
1121Na18Na
1222Mg
1323Al
1424Si
1525P
1626S

 

External data and identifiers

Adopted Levels, Gammas:NuDat 18O

 


Category: Isotopes

Last update: 11.10.2020



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