矽（原子量：28.0855(3)）共有23個已知同位素，質量數介於22-44之間，其中有3個是穩定的，其他都具有放射性。天然存在的矽同位素有5個，分別是穩定的28Si、29Si、30Si和具放射性的31Si及32Si，31Si及32Si在自然界中僅痕量存在，為宇宙射線散裂所產生。其餘同位素都不出現在自然界中，只有在實驗室製造出來過，且半衰期都極短，非常不穩定。
圖表
|-
| rowspan=2|22Si
| rowspan=2 style="text-align:right" | 14
| rowspan=2 style="text-align:right" | 8
| rowspan=2|22.03611(54)#
| rowspan=2|29(2) ms
| (68%)
| 22Al
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β+, p (32%)
| 21Mg
|-
| 23Si
| style="text-align:right" | 14
| style="text-align:right" | 9
| 23.02571(54)#
| 42.3(4) ms
| β+
| 23Al
| 3/2+#
|
|
|-
| rowspan=2|24Si
| rowspan=2 style="text-align:right" | 14
| rowspan=2 style="text-align:right" | 10
| rowspan=2|24.011535(21)
| rowspan=2|140(8) ms
| β+ (92%)
| 24Al
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β+, p (8%)
| 23Mg
|-
| rowspan=2|25Si
| rowspan=2 style="text-align:right" | 14
| rowspan=2 style="text-align:right" | 11
| rowspan=2|25.004109(11)
| rowspan=2|220(3) ms
| β+ (63.19%)
| 25Al
| rowspan=2|5/2+
| rowspan=2|
| rowspan=2|
|-
| β+, p (36.8%)
| 24Mg
|-
| 26Si
| style="text-align:right" | 14
| style="text-align:right" | 12
| 25.99233382(12)
| 2.234(13) s
| β+
| 26Al
| 0+
|
|
|-
| 27Si
| style="text-align:right" | 14
| style="text-align:right" | 13
| 26.98670469(12)
| 4.16(2) s
| β+
| 27Al
| 5/2+
|
|
|-
| 28Si
| style="text-align:right" | 14
| style="text-align:right" | 14
| 27.9769265344(6)
| colspan=3 align=center|**'
| 0+
| 0.92223(19)
| 0.92205–0.92241
|-
| 29Si
| style="text-align:right" | 14
| style="text-align:right" | 15
| 28.9764946643(6)
| colspan=3 align=center|穩定
| 1/2+
| 0.04685(8)
| 0.04678–0.04692
|-
| 30Si
| style="text-align:right" | 14
| style="text-align:right" | 16
| 29.973770137(23)
| colspan=3 align=center|穩定
| 0+
| 0.03092(11)
| 0.03082–0.03102
|-
| 31Si
| style="text-align:right" | 14
| style="text-align:right" | 17
| 30.97536320(5)
| 157.3(3) min
| β−
| 31P
| 3/2+
|
|
|-
| 32Si
| style="text-align:right" | 14
| style="text-align:right" | 18
| 31.9741515(3)
| 153(19) y
| β−
| 32P
| 0+
| 痕量或天然放射性
|
|-
| 33Si
| style="text-align:right" | 14
| style="text-align:right" | 19
| 32.9779770(8)
| 6.18(18) s
| β−
| 33P
| (3/2+)
|
|
|-
| 34Si
| style="text-align:right" | 14
| style="text-align:right" | 20
| 33.9785380(9)
| 2.77(20) s
| β−
| 34P
| 0+
|
|
|-
| rowspan=2|35Si
| rowspan=2 style="text-align:right" | 14
| rowspan=2 style="text-align:right" | 21
| rowspan=2|34.98455(4)
| rowspan=2|780(120) ms
| β− (94.74%)
| 35P
| rowspan=2|7/2−#
| rowspan=2|
| rowspan=2|
|-
| β−, n (5.26%)
| 34P
|-
| rowspan=2|36Si
| rowspan=2 style="text-align:right" | 14
| rowspan=2 style="text-align:right" | 22
| rowspan=2|35.98665(8)
| rowspan=2|0.45(6) s
| β− (88%)
| 36P
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β−, n (12%)
| 35P
|-
| rowspan=2|37Si
| rowspan=2 style="text-align:right" | 14
| rowspan=2 style="text-align:right" | 23
| rowspan=2|36.99295(12)
| rowspan=2|90(60) ms
| β− (83%)
| 37P
| rowspan=2|(7/2−)#
| rowspan=2|
| rowspan=2|
|-
| β−, n (17%)
| 36P
|-
| rowspan=2|38Si
| rowspan=2 style="text-align:right" | 14
| rowspan=2 style="text-align:right" | 24
| rowspan=2|37.99552(11)
| rowspan=2|90# ms [>1 µs]
| β−, n
| 37P
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β−
| 38P
|-
| 39Si
| style="text-align:right" | 14
| style="text-align:right" | 25
| 39.00249(15)
| 47.5(20) ms
| β−
| 39P
| 7/2−#
|
|
|-
| 40Si
| style="text-align:right" | 14
| style="text-align:right" | 26
| 40.00608(13)
| 33.0(10) ms
| β−
| 40P
| 0+
|
|
|-
| 41Si
| style="text-align:right" | 14
| style="text-align:right" | 27
| 41.01417(32)#
| 20.0(25) ms
| β−
| 41P
| 7/2−#
|
|
|-
| 42Si
| style="text-align:right" | 14
| style="text-align:right" | 28
| 42.01808(32)#
| 13(4) ms
| β−
| 42P
| 0+
|
|
|-
| 43Si
| style="text-align:right" | 14
| style="text-align:right" | 29
| 43.02612(43)#
| 15# ms [>260 ns]
|
|
| 3/2−#
|
|
|-
| 44Si
| style="text-align:right" | 14
| style="text-align:right" | 30
| 44.03147(54)#
| 10# ms
|
|
| 0+
|
|
|}
參考文獻
- Isotopic compositions and standard atomic masses from [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)] . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html Atomic Weights Revised (2005)] .
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties] , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005).
* David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition*, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.
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