砷嘅同位素

砷有43個同位素，得⁷⁵As（砷-75）係穩定，其餘嘅都係唔穩定。

圖表

符號	Z（p）	N（n）	質量（u）	半衰期	原子核自旋	相對豐度	相對豐度嘅變化率
	激發能量
60As	33	27	59.99313(64)#		5+#
61As	56	28	60.98062(64)#		3/2-#
62As	33	29	61.97320(32)#		1+#
63As	33	30	62.96369(54)#		(3/2-)#
64As	33	31	63.95757(38)#	40(30) ms [18(+43-7) ms]	0+#
65As	33	32	64.94956(32)#	170(30) ms	3/2-#
66As	33	33	65.94471(73)	95.77(23) ms	(0+)
66m1As	1356.70(17) keV			1.1(1) µs	(5+)
66m2As	3023.9(3) keV			8.2(5) µs	(9+)
67As	33	34	66.93919(11)	42.5(12) s	(5/2-)
68As	33	35	67.93677(5)	151.6(8) s	3+
68mAs	425.21(16) keV			111(20) s [?107(+23-16) ns]	1+
69As	33	36	68.93227(3)	15.2(2) min	5/2-
70As	33	37	69.93092(5)	52.6(3) min	4(+#)
70mAs	32.008(23) keV			96(3) µs	2(+)
71As	33	38	70.927112(5)	65.28(15) h	5/2-
72As	33	39	71.926752(5)	26.0(1) h	2-
73As	33	40	72.923825(4)	80.30(6) d	3/2-
74As	33	41	73.9239287(25)	17.77(2) d	2-
75As	33	42	74.9215965(20)	穩定	3/2-	1.0000
75mAs	303.9241(7) keV			17.62(23) ms	9/2+
76As	33	43	75.922394(2)	1.0942(7) d	2-
76mAs	44.425(1) keV			1.84(6) µs	(1)+
77As	33	44	76.9206473(25)	38.83(5) h	3/2-
77mAs	475.443(16) keV			114.0(25) µs	9/2+
78As	33	45	77.921827(11)	90.7(2) min	2-
79As	33	46	78.920948(6)	9.01(15) min	3/2-
79mAs	772.81(6) keV			1.21(1) µs	(9/2)+
80As	33	47	79.922534(25)	15.2(2) s	1+
81As	33	48	80.922132(6)	33.3(8) s	3/2-
82As	33	49	81.92450(21)	19.1(5) s	(1+)
82mAs	250(200) keV			13.6(4) s	(5-)
83As	33	50	82.92498(24)	13.4(3) s	3/2-#
84As	33	51	83.92906(32)#	4.02(3) s	(3)(+#)
84mAs	0(100)# keV			650(150) ms
85As	33	52	84.93202(21)#	2.021(10) s	(3/2-)#
86As	33	53	85.93650(32)#	0.945(8) s
87As	33	54	86.93990(32)#	0.56(8) s	3/2-#
88As	33	55	87.94494(54)#	300# ms [>300 ns]
89As	33	56	88.94939(54)#	200# ms [>300 ns]	3/2-#
90As	33	57	89.95550(86)#	80# ms [>300 ns]
91As	33	58	90.96043(97)#	50# ms [>300 ns]	3/2-#
92As	33	59	91.96680(97)#	30# ms [>300 ns]

備註：畫上#號嘅數據代表冇經過實驗嘅證明，只係理論推測，而用咗括號括係代表數據唔確定。

參攷

• 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.

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