Nitrogen-18
Properties and data of the isotope 18N.
See also: list of Nitrogen isotopes.
General data
Name of the isotope:Nitrogen-18; N-18Symbol:18N or 187NMass number A:18 (= number of nucleons)Atomic number Z:7 (= number of protons)Neutrons N:11Isotopic mass:18.014078(20) u (atomic weight of Nitrogen-18)Nuclide mass:18.010238 u (calculated nuclear mass without electrons)Mass excess:13.11357 MeVMass defect:0.1360113 u (per nucleus)Nuclear binding energy:126.69370988 MeV (per nucleus)
7.03853944 MeV (average binding energy per nucleon)Separation energy:SN = 2.828(24) MeV (first neutron)
SP = 15.208(25) MeV (first proton)Half-life:624(12) msDecay constant λ:1.1108127893589 s-1Specific activity α:3.716372825854 × 10+22 Bq g-1
1004425088068.8 Ci g-1Spin and parity:
(nuclear angular momentum)1-Isobaric spin: 2Magnetic dipole moment:μ(μN) = 0.3274(4)Nuclear g-factor:gl = 0.3274Mirror nucleus:Sodium-18Year of discovery:1964
Radioactive Decay
Half-life T½ = 624(12) ms respectively 6.24 × 10-1 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 18O | 73.5 % | 13.896(19) MeV | |
β-, n | 17O | 14.3 % | 5.851(19) MeV | |
β-, α | 14C | 12.2 % | | |
Parent Nuclides
Direct parent isotope is: 18C.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 11) and isobaric (same nucleon number A = 18) with Nitrogen-18. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 11 | Isobar A = 18 |
4 | 15Be | |
5 | 16B | 18B |
6 | 17C | 18C |
7 | 18N | 18N |
8 | 19O | 18O |
9 | 20F | 18F |
10 | 21Ne | 18Ne |
11 | 22Na | 18Na |
12 | 23Mg | |
13 | 24Al | |
14 | 25Si | |
15 | 26P | |
16 | 27S | |
17 | 28Cl | |
External data and identifiers
Last update: 2023-10-03
Perma link: https://www.chemlin.org/isotope/nitrogen-18
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