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Carbon-12

Properties and data of the isotope 12C.

 

See also: list of Carbon isotopes.

 

General data

Name of the isotope:Carbon-12; C-12Symbol:12CMass number A:12Atomic number Z:6 (= number of protons)Neutrons N:6Isotopic mass:12.00000000000 u (atomic weight of Carbon-12)Nuclide mass:11.9967085 u (calculated nuclear mass without electrons)Mass excess:0 MeVMass defect:0.098939688000002 u (per nucleus)Nuclear binding energy:92.16172573 MeV (per nucleus)
7.68014381 MeV (average binding energy per nucleon)
Separation energy:SN = 18.72071(6) MeV (first neutron)
SP = 15.95668(1) MeV (first proton)
Half-life:stableSpin and parity:0+Charge radius:2.4702(22) femtometer fmYear of discovery:1919

 

Parent Nuclides

Direct parent isotopes are: 12B, 12N.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Kohlenstoff
Isotopic mixture
12,011 u100 %
Isotope 12C12,00000000000 u98,94 %stable0+
Isotope 13C13,003354835(2) u1,06 %stable1/2-
Isotope 14C14,003241988(4) u5700(30) a0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 6) and isobaric (same nucleon number A = 12) with Carbon-12. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 6Isobar A = 12
17H
28He
39Li12Li
410Be12Be
511B12B
612C12C
713N12N
814O12O
915F
1016Ne

 

External data and identifiers

Adopted Levels, Gammas:NuDat 12C

 


Category: Isotopes

Last update: 11.10.2020



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