Silicon-30

Properties and data of the isotope ³⁰Si.

Contents

Silicon-30 is a stable, naturally occurring isotope of the chemical element silicon, which has 16 neutrons in its atomic nucleus in addition to the element-specific 14 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 30. The nuclide was discovered in 1924 [1].

See also: List of individual Silicon isotopes (and general data sources).

General data

Name of the isotope:Silicon-30; Si-30Symbol:³⁰Si or 3014SiMass number A:30 (= number of nucleons)Atomic number Z:14 (= number of protons)Neutrons N:16Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1428571428571 (= neutron-proton ratio)Neutron excess (N-Z):2Isotopic mass:29.973770137(23) u (atomic weight of Silicon-30)Nuclide mass:29.9660901 u (calculated nuclear mass without electrons)Mass excess:-24.43296 MeVMass defect:0.274418967 u (per nucleus)Nuclear binding energy:255.61962125 MeV (per nucleus)
8.52065404 MeV (average binding energy per nucleon)Separation energy:S_N = 10.609199(22) MeV (first neutron)
S_P = 13.5142(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:3.1336(40) femtometer fmMirror nucleus:Sulfur-30Year of discovery:1924

Parent Nuclides

Direct parent isotopes are: ³⁰P, ³⁰Al.

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	27.9769265344(6) u	92.254 % [92.191 - 92.318 %]	stable	0+
Isotope ²⁹Si	28.9764946643(6) u	4.673 % [4.645 - 4.699 %]	stable	1/2+
Isotope ³⁰Si	29.973770137(23) u	3.073 % [3.037 - 3.110 %]	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 16) and isobaric (same nucleon number A = 30) with Silicon-30. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 16	Isobar A = 30
5	²¹B
6	²²C
7	²³N
8	²⁴O
9	²⁵F	³⁰F
10	²⁶Ne	³⁰Ne
11	²⁷Na	³⁰Na
12	²⁸Mg	³⁰Mg
13	²⁹Al	³⁰Al
14	³⁰Si	³⁰Si
15	³¹P	³⁰P
16	³²S	³⁰S
17	³³Cl	³⁰Cl
18	³⁴Ar	³⁰Ar
19	³⁵K
20	³⁶Ca
21	³⁷Sc
22	³⁸Ti