Isotopes of oxygen
List of isotopes
Bold for stable isotopes The ratio between ¹⁶O and ¹⁸O is used to deduce ancient temperatures Can be used in NMR studies of metabolic pathways Can be used in studying certain metabolic pathways

Isotopes of oxygen

Section Title: List of isotopes
Table Section Text: Bold for stable isotopes The ratio between ¹⁶O and ¹⁸O is used to deduce ancient temperatures Can be used in NMR studies of metabolic pathways Can be used in studying certain metabolic pathways

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)

11O	8	3	[~3.4 MeV]	2p	9C	3/2-, 5/2+

12O	8	4	12.034262(26)	> 6.3(30)×10−21 s [0.40(25) MeV]	2p (60.0%)	10C	0+

p (40.0%)	11N

13O	8	5	13.024815(10)	8.58(5) ms	β+ (89.1%)	13N	(3/2−)

β+, p (10.9%)	12C

14O	8	6	14.008596706(27)	70.620(13) s	β+	14N	0+

15O	8	7	15.0030656(5)	122.24(16) s	β+	15N	1/2−

16O	8	8	15.99491461960(17)	Stable	0+	0.99757(16)	0.99738–0.99776

17O	8	9	16.9991317566(7)	Stable	5/2+	3.8(1)×10−4	3.7×10−4–4.0×10−4

18O	8	10	17.9991596128(8)	Stable	0+	2.05(14)×10−3	1.88×10−3–2.22×10−3

19O	8	11	19.0035780(28)	26.470(6) s	β−	19F	5/2+

20O	8	12	20.0040754(9)	13.51(5) s	β−	20F	0+

21O	8	13	21.008655(13)	3.42(10) s	β−	21F	(5/2+)

22O	8	14	22.00997(6)	2.25(9) s	β− (78%)	22F	0+

β−, n (22%)	21F

23O	8	15	23.01570(13)	97(8) ms	β− (93%)	23F	1/2+

β−, n (7%)	22F

24O	8	16	24.01986(18)	77.4(45) ms	β− (57%)	24F	0+

β−, n (43%)	23F

25O	8	17	25.02934(18)	5.18(0.35)×10−21 s	n	24O	3/2+#

26O	8	18	26.03721(18)	4.2(3.3) ps	2n	24O

Sentence(s)

The longest-lived radioisotope is ¹⁵O with a half-life of 122.24 seconds.

final_sentence: The longest-lived radioisotope is ¹⁵O with a half-life of 122.24 seconds.