Isotopes of chlorine

Chlorine (Cl)
Standard atomic mass: 35.453(2) 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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
²⁸Cl	17	11	28.02851(54)#		(1+)#
²⁹Cl	17	12	29.01411(21)#	<20 ns	(3/2+)#
³⁰Cl	17	13	30.00477(21)#	<30 ns	(3+)#
³¹Cl	17	14	30.99241(5)	150(25) ms	3/2+
³²Cl	17	15	31.985690(7)	298(1) ms	1+
³³Cl	17	16	32.9774519(5)	2.511(3) s	3/2+
³⁴Cl	17	17	33.97376282(19)	1.5264(14) s	0+
^34mCl	146.36(3) keV			32.00(4) min	3+
³⁵Cl	17	18	34.96885268(4)	STABLE	3/2+	0.7576(10)	0.75644-0.75923
³⁶Cl	17	19	35.96830698(8)	3.01(2)E+5 a	2+
³⁷Cl	17	20	36.96590259(5)	STABLE	3/2+	0.2424(10)	0.24077-0.24356
³⁸Cl	17	21	37.96801043(10)	37.24(5) min	2-
^38mCl	671.361(8) keV			715(3) ms	5-
³⁹Cl	17	22	38.9680082(19)	55.6(2) min	3/2+
⁴⁰Cl	17	23	39.97042(3)	1.35(2) min	2-
⁴¹Cl	17	24	40.97068(7)	38.4(8) s	(1/2+,3/2+)
⁴²Cl	17	25	41.97325(15)	6.8(3) s
⁴³Cl	17	26	42.97405(17)	3.07(7) s	3/2+#
⁴⁴Cl	17	27	43.97828(12)	0.56(11) s
⁴⁵Cl	17	28	44.98029(13)	400(40) ms	3/2+#
⁴⁶Cl	17	29	45.98421(77)	232(2) ms
⁴⁷Cl	17	30	46.98871(64)#	101(6) ms	3/2+#
⁴⁸Cl	17	31	47.99495(75)#	100# ms [>200 ns]
⁴⁹Cl	17	32	49.00032(86)#	50# ms [>200 ns]	3/2+#
⁵⁰Cl	17	33	50.00784(97)#	20# ms
⁵¹Cl	17	34	51.01449(107)#	2# ms [>200 ns]	3/2+#

Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
Commercially available materials may have been subjected to an undisclosed or inadvertent isotopic fractionation. Substantial deviations from the given mass and composition can occur.
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.

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.