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
符號	激發能量			半衰期	原子核自旋	相對豐度	相對豐度嘅變化率
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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