Silicon-29

Properties and data of the isotope ²⁹Si.

Contents

General data

Name of the isotope:Silicon-29; Si-29Symbol:²⁹Si or 2914SiMass number A:29 (= number of nucleons)Atomic number Z:14 (= number of protons)Neutrons N:15Isotopic mass:28.976494665(3) u (atomic weight of Silicon-29)Nuclide mass:28.9688146 u (calculated nuclear mass without electrons)Mass excess:-21.89508 MeVMass defect:0.263029523 u (per nucleus)Nuclear binding energy:245.0104225 MeV (per nucleus)
8.44863526 MeV (average binding energy per nucleon)Separation energy:S_N = 8.47360(0) MeV (first neutron)
S_P = 12.33340(8) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μ_N) = -0.555052(3)Charge radius:3.1176(52) femtometer fmMirror nucleus:Phosphorus-29Year of discovery:1920

Parent Nuclides

Direct parent isotopes are: ²⁹P, ²⁹Al.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Silicon Isotopic mixture	28.085 u	100 %
Isotope ²⁸Si	27.976926535(3) u	92.254 % [92.191 - 92.318 %]	stable	0+
Isotope ²⁹Si	28.976494665(3) u	4.673 % [4.645 - 4.699 %]	stable	1/2+
Isotope ³⁰Si	29.97377001(2) u	3.073 % [3.037 - 3.110 %]	stable	0+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ²⁹Si

Isotope:²⁹Si-NMRQuantity:4.673 % [4.645 - 4.699 %]Spin:1/2+Nuclearmagnetic moment
μ/μ_N:-0.555052(3)Gyromagnetic ratio γ:- 5.3188 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = -1.110104Resonance frequency:v₀ = 8.4655 at 1 TRelative Sensitivity:0.00786 (H₀ = const.)
0.1988 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 15) and isobaric (same nucleon number A = 29) with Silicon-29. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 15	Isobar A = 29
5	²⁰B
6	²¹C
7	²²N
8	²³O
9	²⁴F	²⁹F
10	²⁵Ne	²⁹Ne
11	²⁶Na	²⁹Na
12	²⁷Mg	²⁹Mg
13	²⁸Al	²⁹Al
14	²⁹Si	²⁹Si
15	³⁰P	²⁹P
16	³¹S	²⁹S
17	³²Cl	²⁹Cl
18	³³Ar
19	³⁴K
20	³⁵Ca
21	³⁶Sc