Isotopes of potassium

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Potassium (K)
Standard atomic mass: 39.0983(1) 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
32K	19	13	32.02192(54)#		1+#
32mK	950(100)# keV			?	4+#
33K	19	14	33.00726(21)#	<25 ns	(3/2+)#
34K	19	15	33.99841(32)#	<40 ns	1+#
35K	19	16	34.988010(21)	178(8) ms	3/2+
36K	19	17	35.981292(8)	342(2) ms	2+
37K	19	18	36.97337589(10)	1.226(7) s	3/2+
38K	19	19	37.9690812(5)	7.636(18) min	3+
38m1K	130.50(28) keV			924.2(3) ms	0+
38m2K	3458.0(2) keV			21.98(11) µs	(7+),(5+)
39K	19	20	38.96370668(20)	STABLE	3/2+	0.932581(44)
40K	19	21	39.96399848(21)	1.248(3)E+9 a	4-	0.000117(1)
40mK	1643.639(11) keV			336(12) ns	0+
41K	19	22	40.96182576(21)	STABLE	3/2+	0.067302(44)
42K	19	23	41.96240281(24)	12.360(12) h	2-
43K	19	24	42.960716(10)	22.3(1) h	3/2+
44K	19	25	43.96156(4)	22.13(19) min	2-
45K	19	26	44.960699(11)	17.3(6) min	3/2+
46K	19	27	45.961977(17)	105(10) s	2(-)
47K	19	28	46.961678(9)	17.50(24) s	1/2+
48K	19	29	47.965514(26)	6.8(2) s	(2-)
49K	19	30	48.96745(8)	1.26(5) s	(3/2+)
50K	19	31	49.97278(30)	472(4) ms	(0-,1,2-)
51K	19	32	50.97638(54)#	365(5) ms	3/2+#
52K	19	33	51.98261(75)#	105(5) ms	(2-)#
53K	19	34	52.98712(75)#	30(5) ms	(3/2+)#
54K	19	35	53.99420(97)#	10(5) ms	2-#
55K	19	36	54.99971(107)#	3# ms	3/2+#

[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 argon	Isotopes of potassium	Isotopes of calcium
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