Isotopes of chromium

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Chromium (Cr)
Standard atomic mass: 51.9961(6) 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
42Cr	24	18	42.00643(32)#	14(3) ms [13(+4-2) ms]	0+
43Cr	24	19	42.99771(24)#	21.6(7) ms	(3/2+)
44Cr	24	20	43.98555(5)#	54(4) ms [53(+4-3) ms]	0+
45Cr	24	21	44.97964(54)	50(6) ms	7/2-#
45mCr	50(100)# keV			1# ms	3/2+#
46Cr	24	22	45.968359(21)	0.26(6) s	0+
47Cr	24	23	46.962900(15)	500(15) ms	3/2-
48Cr	24	24	47.954032(8)	21.56(3) h	0+
49Cr	24	25	48.9513357(26)	42.3(1) min	5/2-
50Cr	24	26	49.9460442(11)	STABLE [>1.3E+18 a]	0+	0.04345(13)	0.04294-0.04345
51Cr	24	27	50.9447674(11)	27.7025(24) d	7/2-
52Cr	24	28	51.9405075(8)	STABLE	0+	0.83789(18)	0.83762-0.83790
53Cr	24	29	52.9406494(8)	STABLE	3/2-	0.09501(17)	0.09501-0.09553
54Cr	24	30	53.9388804(8)	STABLE	0+	0.02365(7)	0.02365-0.02391
55Cr	24	31	54.9408397(8)	3.497(3) min	3/2-
56Cr	24	32	55.9406531(20)	5.94(10) min	0+
57Cr	24	33	56.943613(2)	21.1(10) s	(3/2-)
58Cr	24	34	57.94435(22)	7.0(3) s	0+
59Cr	24	35	58.94859(26)	460(50) ms	5/2-#
59mCr	503.0(17) keV			96(20) µs	(9/2+)
60Cr	24	36	59.95008(23)	560(60) ms	0+
61Cr	24	37	60.95472(27)	261(15) ms	5/2-#
62Cr	24	38	61.95661(36)	199(9) ms	0+
63Cr	24	39	62.96186(32)#	129(2) ms	(1/2-)#
64Cr	24	40	63.96441(43)#	43(1) ms	0+
65Cr	24	41	64.97016(54)#	27(3) ms	(1/2-)#
66Cr	24	42	65.97338(64)#	10(6) ms	0+
67Cr	24	43	66.97955(75)#	10# ms [>300 ns]	1/2-#

[edit] Notes

• 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 vanadium	Isotopes of chromium	Isotopes of manganese
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