Isotopes of silicon
List of isotopes
Bold for stable isotopes

Isotopes of silicon

Section Title: List of isotopes
Table Section Text: Bold for stable isotopes

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)

22Si	14	8	22.03453(22)#	29(2) ms	β+ (68%)	22Al	0+

β+, p (32%)	21Mg

23Si	14	9	23.02552(21)#	42.3(4) ms	β+	23Al	3/2+#

24Si	14	10	24.011546(21)	140(8) ms	β+ (92%)	24Al	0+

β+, p (8%)	23Mg

25Si	14	11	25.004106(11)	220(3) ms	β+ (63.19%)	25Al	5/2+

β+, p (36.8%)	24Mg

26Si	14	12	25.992330(3)	2.234(13) s	β+	26Al	0+

27Si	14	13	26.98670491(16)	4.16(2) s	β+	27Al	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	β−	31P	3/2+

32Si	14	18	31.97414808(5)	153(19) y	β−	32P	0+	trace	cosmogenic

33Si	14	19	32.978000(17)	6.18(18) s	β−	33P	(3/2+)

34Si	14	20	33.978576(15)	2.77(20) s	β−	34P	0+

35Si	14	21	34.98458(4)	780(120) ms	β− (94.74%)	35P	7/2−#

β−, n (5.26%)	34P

36Si	14	22	35.98660(13)	0.45(6) s	β− (88%)	36P	0+

β−, n (12%)	35P

37Si	14	23	36.99294(18)	90(60) ms	β− (83%)	37P	(7/2−)#

β−, n (17%)	36P

38Si	14	24	37.99563(15)	90# ms [>1 µs]	β−, n	37P	0+

β−	38P

39Si	14	25	39.00207(36)	47.5(20) ms	β−	39P	7/2−#

40Si	14	26	40.00587(60)	33.0(10) ms	β−	40P	0+

41Si	14	27	41.01456(198)	20.0(25) ms	β−	41P	7/2−#

42Si	14	28	42.01979(54)#	13(4) ms	β−	42P	0+

43Si	14	29	43.02866(75)#	15# ms [>260 ns]	3/2−#

44Si	14	30	44.03526(86)#	10# ms	0+

Sentence(s)

After ³²Si, ³¹Si has the second longest half-life at 157.3 minutes.

final_sentence: After ³²Si, ³¹Si has the second longest half-life at 157.3 minutes.