Isotopes of silicon

From Wikipedia, the free encyclopedia

Silicon (Si)
Standard atomic mass: 28.0855(3) u

[edit] Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
	excitation energy
22Si	14	8	22.03453(22)#	29(2) ms	0+
23Si	14	9	23.02552(21)#	42.3(4) ms	3/2+#
24Si	14	10	24.011546(21)	140(8) ms	0+
25Si	14	11	25.004106(11)	220(3) ms	5/2+
26Si	14	12	25.992330(3)	2.234(13) s	0+
27Si	14	13	26.98670491(16)	4.16(2) s	5/2+
28Si	14	14	27.9769265325(19)	STABLE	0+	0.92223(19)	0.92205-0.92241
29Si	14	15	28.976494700(22)	STABLE	1/2+	0.04685(8)	0.04678-0.04692
30Si	14	16	29.97377017(3)	STABLE	0+	0.03092(11)	0.03082-0.03102
31Si	14	17	30.97536323(4)	157.3(3) min	3/2+
32Si	14	18	31.97414808(5)	132(13) a	0+
33Si	14	19	32.978000(17)	6.18(18) s	(3/2+)
34Si	14	20	33.978576(15)	2.77(20) s	0+
35Si	14	21	34.98458(4)	780(120) ms	7/2-#
36Si	14	22	35.98660(13)	0.45(6) s	0+
37Si	14	23	36.99294(18)	90(60) ms	(7/2-)#
38Si	14	24	37.99563(15)	90# ms [>1 µs]	0+
39Si	14	25	39.00207(36)	47.5(20) ms	7/2-#
40Si	14	26	40.00587(60)	33.0(10) ms	0+
41Si	14	27	41.01456(198)	20.0(25) ms	7/2-#
42Si	14	28	42.01979(54)#	13(4) ms	0+
43Si	14	29	43.02866(75)#	15# ms [>260 ns]	3/2-#
44Si	14	30	44.03526(86)#	10# ms	0+

[edit] Notes

• The precision of the isotope abundances and atomic mass is limited through variations. The given ranges should be applicable to any normal terrestrial material.
• Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
• Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

[edit] References

• Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
• Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and 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. 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 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.

Isotopes of aluminium	Isotopes of silicon	Isotopes of phosphorus
Index to isotope pages