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主要的鐨同位素
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鐨的同位素

圖表

符號	Z	N	同位素質量（u） ^{[n 1]}^{[n 2]}	半衰期 ^{[n 2]}	衰變方式^[1]	衰變產物	原子核自旋^{[n 1]}
符號	激發能量^{[n 2]}			半衰期 ^{[n 2]}	衰變方式^[1]	衰變產物	原子核自旋^{[n 1]}
²⁴¹Fm	100	141	241.07421(32)#	730(60) µs	SF(>78%)	(various)	5/2#+
²⁴¹Fm	100	141	241.07421(32)#	730(60) µs	α (<14%)	²³⁷Cf	5/2#+
²⁴²Fm	100	142	242.07343(43)#	<4 μs^[2]	SF	(various)	0+
²⁴³Fm	100	143	243.07447(23)#	231(9) ms	α (91%)	²³⁹Cf	7/2−#
					SF (9%)	(various)
					β⁺ （不常見）	²⁴³Es
²⁴⁴Fm	100	144	244.07404(22)#	3.12(8) ms	SF (99%)	(various)	0+
²⁴⁴Fm	100	144	244.07404(22)#	3.12(8) ms	α (1%)	²⁴⁰Cf	0+
²⁴⁵Fm	100	145	245.07535(21)#	4.2(13) s	α (95.7%)	²⁴¹Cf	1/2+#
					β⁺ (4.2%)	²⁴⁵Es
					SF (.13%)	(various)
²⁴⁶Fm	100	146	246.075350(17)	1.54(4) s	α (85%)	²⁴²Cf	0+
					β⁺ (10%)	²⁴⁶Es
					β⁺, SF (10%)	(various)
					SF (4.5%)	(various)
²⁴⁷Fm	100	147	247.07695(12)#	31(1) s	α (>50%)	²⁴³Cf	(7/2+)
²⁴⁷Fm	100	147	247.07695(12)#	31(1) s	β⁺ (<50%)	²⁴⁷Es	(7/2+)
²⁴⁸Fm	100	148	248.077186(9)	35.1(8) s	α (93%)	²⁴⁴Cf	0+
					β⁺ (7%)	²⁴⁸Es
					SF (.10%)	(various)
²⁴⁹Fm	100	149	249.078928(7)	1.6(1) min	β⁺ (85%)	²⁴⁹Es	(7/2+)#
²⁴⁹Fm	100	149	249.078928(7)	1.6(1) min	α (15%)	²⁴⁵Cf	(7/2+)#
²⁵⁰Fm	100	150	250.079521(9)	30.4(15) min	α (90%)	²⁴⁶Cf	0+
					ε (10%)	²⁵⁰Es
					SF (6.9×10⁻³%)	(various)
^250mFm	1199.2(10) keV			1.92(5) s	IT	²⁵⁰Fm	(8−)
²⁵¹Fm	100	151	251.081540(16)	5.30(8) h	β⁺ (98.2%)	²⁵¹Es	(9/2−)
²⁵¹Fm	100	151	251.081540(16)	5.30(8) h	α (1.8%)	²⁴⁷Cf	(9/2−)
^251mFm	200.09(11) keV			21.1(16) µs			(5/2+)
²⁵²Fm	100	152	252.082467(6)	25.39(4) h	α (99.99%)	²⁴⁸Cf	0+
²⁵²Fm	100	152	252.082467(6)	25.39(4) h	SF (.0023%)	(various)	0+
²⁵³Fm	100	153	253.085185(4)	3.00(12) d	ε (88%)	²⁵³Es	(1/2)+
²⁵³Fm	100	153	253.085185(4)	3.00(12) d	α (12%)	²⁴⁹Cf	(1/2)+
²⁵⁴Fm	100	154	254.0868544(30)	3.240(2) h	α (99.94%)	²⁵⁰Cf	0+
²⁵⁴Fm	100	154	254.0868544(30)	3.240(2) h	SF (.0592%)	(various)	0+
²⁵⁵Fm	100	155	255.089964(5)	20.07(7) h	α	²⁵¹Cf	7/2+
²⁵⁵Fm	100	155	255.089964(5)	20.07(7) h	SF (2.4×10⁻⁵%)	(various)	7/2+
²⁵⁶Fm	100	156	256.091774(8)	157.6(13) min	SF (91.9%)	(various)	0+
²⁵⁶Fm	100	156	256.091774(8)	157.6(13) min	α (8.1%)	²⁵²Cf	0+
²⁵⁷Fm^{[n 3]}	100	157	257.095106(7)	100.5(2) d	α (99.79%)	²⁵³Cf	(9/2+)
²⁵⁷Fm^{[n 3]}	100	157	257.095106(7)	100.5(2) d	SF (.21%)	(various)	(9/2+)
²⁵⁸Fm	100	158	258.09708(22)#	370(14) µs	SF	(various)	0+
²⁵⁹Fm	100	159	259.1006(3)#	1.5(3) s	SF	(various)	3/2+#
²⁶⁰Fm^{[n 4]}^{[n 5]}	100	160	260.10281(55)#	4 ms			0+

^ ^1.0 ^1.1 畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
^ ^2.0 ^2.1 ^2.2 用括號括起來的數據代表不確定性。
^ Heaviest nuclide produced via neutron capture
^ Discovery of this isotope is unconfirmed
^ Not directly synthesized, occurs as decay product of ²⁶⁰Md

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参考文獻

^ Universal Nuclide Chart. nucleonica. [2015-11-03]. （原始内容存档于2017-02-19）.
^ Khuyagbaatar, J.; Hofmann, S.; Heßberger, F. P.; Ackermann, D.; Burkhard, H. G.; Heinz, S.; Kindler, B.; Kojouharov, I.; Lommel, B.; Mann, R.; Maurer, J.; Nishio, K.; Novikov, Yu. Spontaneous fission of neutron-deficient fermium isotopes and the new nucleus 241Fm (PDF). The European Physical Journal A. 1 August 2008, 37 (2): 177–183 [24 June 2023]. Bibcode:2008EPJA...37..177K. ISSN 1434-601X. S2CID 18977014. doi:10.1140/epja/i2008-10608-4 （英语）.

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).
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 （页面存档备份，存于互联网档案馆）, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database （页面存档备份，存于互联网档案馆） (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.