Neon-21

Properties and data of the isotope ²¹Ne.

Content

General Data

Parent Nuclides

NMR Data

Isotones und Isobares

Literature

General data

Name of the isotope:Neon-21; Ne-21Symbol:²¹Ne or 2110NeMass number A:21 (= number of nucleons)Atomic number Z:10 (= number of protons)Neutrons N:11Isotopic mass:20.9938467(3) u (atomic weight of Neon-21)Nuclide mass:20.9883609 u (calculated nuclear mass without electrons)Mass excess:-5.73176 MeVMass defect:0.179717696 u (per nucleus)Nuclear binding energy:167.40595552 MeV (per nucleus)
7.97171217 MeV (average binding energy per nucleon)Separation energy:S_N = 6.76116(4) MeV (first neutron)
S_P = 13.00328(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = -0.66170(3)Charge radius:2.9695(33) femtometer fmMirror nucleus:Sodium-21Year of discovery:1928

Parent Nuclides

Direct parent isotopes are: ²¹F, ²¹Na.

Occurrence

Comparison of the natural Neon isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Neon Isotopic mixture	20.1797 u	100 %
Isotope ²⁰Ne	19.99244018(2) u	90.48(3) %	stable	0+
Isotope ²¹Ne	20.9938467(3) u	0.27(1) %	stable	3/2+
Isotope ²²Ne	21.9913851(2) u	9.25(3) %	stable	0+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ²¹Ne

Isotope:²¹Ne-NMRQuantity:0.27(1) %Spin:3/2+Nuclearmagnetic moment
μ/μ_N:-0.66170(3)Gyromagnetic ratio γ:- 2.113 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = -0.44113333333333Quadrupole moment Q:+ 0.10155(75) barn (100 fm²)Resonance frequency:v₀ = 3.3631 at 1 TRelative Sensitivity:0.00246 (H₀ = const.)
0.3949 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 11) and isobaric (same nucleon number A = 21) with Neon-21. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 11	Isobar A = 21
4	¹⁵Be
5	¹⁶B	²¹B
6	¹⁷C	²¹C
7	¹⁸N	²¹N
8	¹⁹O	²¹O
9	²⁰F	²¹F
10	²¹Ne	²¹Ne
11	²²Na	²¹Na
12	²³Mg	²¹Mg
13	²⁴Al	²¹Al
14	²⁵Si
15	²⁶P
16	²⁷S
17	²⁸Cl