Isotopes of selenium

Selenium (Se)
Standard atomic mass: 78.96(3) u

Table

Z(p)	N(n)	isotopic mass (u)	nuclide symbol	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
34	31	64.96466(64)#	Se-65
34	32	65.95521(32)#	Se-66
34	33	66.95009(21)#	Se-67
34	34	67.94180(4)	Se-68
34	35	68.93956(4)	Se-69
34	36	69.93339(7)	Se-70
34	37	70.93224(3)	Se-71
34	38	71.927112(13)	Se-72
34	39	72.926765(11)	Se-73
34	40	73.9224764(18)	Se-74	0.0089(4)
34	41	74.9225234(18)	Se-75
34	42	75.9192136(18)	Se-76	0.0937(29)
34	43	76.9199140(18)	Se-77	0.0763(16)
34	44	77.9173091(18)	Se-78	0.2377(28)
34	45	78.9184991(18)	Se-79
34	46	79.9165213(21)	Se-80	0.4961(41)
34	47	80.9179925(22)	Se-81
34	48	81.9166994(22)	Se-82	0.0873(22)
34	49	82.919118(4)	Se-83
34	50	83.918462(16)	Se-84
34	51	84.92225(3)	Se-85
34	52	85.924272(17)	Se-86
34	53	86.92852(4)	Se-87
34	54	87.93142(5)	Se-88
34	55	88.93645(32)#	Se-89
34	56	89.93996(43)#	Se-90
34	57	90.94596(54)#	Se-91
34	58	91.94992(64)#	Se-92
34	59	92.95629(86)#	Se-93
34	60	93.96049(86)#	Se-94

Notes

• The precision of the isotope abundances and atomic mass is limited through variations. The given ranges should be applicable to any normal terrestrial material.
• Values marked # are not purely derived from experimental data, but at least partly from systematic trends.
• Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values from Ame2003 denote one standard deviation. Values from IUPAC are expanded uncertainties.

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).

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