Isotopes of fluorine
List of isotopes
Bold for stable isotopes Has medicinal uses

Isotopes of fluorine

Section Title: List of isotopes
Table Section Text: Bold for stable isotopes Has medicinal uses

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)

excitation energy

14F	9	5	14.03432(4)	500(60)×10−24 s [910 keV]	p	13O	2-

15F	9	6	15.017785(15)	1.1(0.3)×10−21 s [1.0(2) MeV]	p	14O	1/2+

16F	9	7	16.011466(9)	11(6)×10−21 s [40(20) keV]	p	15O	0−

17F	9	8	17.00209524(27)	64.370(27) s	β+	17O	5/2+

18F	9	9	18.0009373(5)	109.739(9) min	β+ (96.86%)	18O	1+

EC (3.14%)	18O

18mF	1121.36(15) keV	162(7) ns	IT	18F	5+

19F	9	10	18.9984031629(9)	Stable	1/2+	1.0000

20F	9	11	19.99998125(3)	11.163(8) s	β−	20Ne	2+

21F	9	12	20.9999489(19)	4.158(20) s	β−	21Ne	5/2+

22F	9	13	22.002999(13)	4.23(4) s	β− (89%)	22Ne	(4+)

β−n (11%)	21Ne

23F	9	14	23.00353(4)	2.23(14) s	β− (86%)	23Ne	5/2+

β−n (14%)	22Ne

24F	9	15	24.00810(10)	384(16) ms	β− (94.1%)	24Ne	3+

β−n (5.9%)	23Ne

25F	9	16	25.01217(10)	80(9) ms	β− (76.9%)	25Ne	(5/2+)

β−n (23.1%)	24Ne

26F	9	17	26.02002(12)	8.2(9) ms	β− (86.5%)	26Ne	1+

β−n (13.5%)	25Ne

26mF	643.4(1) keV	2.2(1) ms	IT (82%)	26F	(4+)

β−n (12%)	25Ne

β−n (6%)	26Ne

27F	9	18	27.02732(42)	4.9(2) ms	β−, n (77%)	26Ne	5/2+#

β− (23%)	27Ne

28F	9	19	28.03622(42)	46×10-21 s	n	27F

29F	9	20	29.04310(56)	2.5(3) ms	β−, n (60%)	28Ne	5/2+#

β− (40%)	29Ne

31F	9	22	31.06027(59)#	1# ms [>260 ns]	β−	31Ne	5/2+#

Sentence(s)

The longest-lived isotope is ¹⁸F with a half-life of 109.739 minutes.

final_sentence: The longest-lived isotope is ¹⁸F with a half-life of 109.739 minutes.