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Isotopes of einsteinium

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Main isotopes^[1]			Decay
	abundance	half-life(t_1/2)	mode	product
²⁵²Es	synth	471.7 d	α	²⁴⁸Bk
²⁵²Es	synth	471.7 d	ε	²⁵²Cf
²⁵³Es	synth	20.47 d	α	²⁴⁹Bk
²⁵³Es	synth	20.47 d	SF	–
²⁵⁴Es	synth	275.7 d	α	²⁵⁰Bk
²⁵⁴Es	synth	275.7 d	β⁻	²⁵⁴Fm
²⁵⁵Es	synth	39.8 d	β⁻	²⁵⁵Fm
			α	²⁵¹Bk
			SF	–

Einsteinium (₉₉Es) is asynthetic element, and thus astandard atomic weight cannot be given. Like all synthetic elements, it has nostable isotopes. The firstisotope to be discovered (innuclear fallout from theIvy Mike H-bomb test) was²⁵³Es in 1952. There are 18 knownradioisotopes from²⁴⁰Es to²⁵⁷Es, and 8nuclear isomers. The longest-lived isotope is²⁵²Es with ahalf-life of 471.7 days, or around 1.293 years.

List of isotopes

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Nuclide ^{[n 1]}	Z	N	Isotopic mass(Da)^[2] ^{[n 2]}^{[n 3]}	Half-life^[1]	Decay mode^[1] ^{[n 4]}	Daughter isotope	Spin and parity^[1] ^{[n 5]}^{[n 6]}
Nuclide ^{[n 1]}	Excitation energy^{[n 6]}			Half-life^[1]	Decay mode^[1] ^{[n 4]}	Daughter isotope	Spin and parity^[1] ^{[n 5]}^{[n 6]}
²⁴⁰Es	99	141	240.06895(39)#	6.0(17) s	α (70%)	²³⁶Bk	4−#
					β⁺ (30%)	²⁴⁰Cf
					β⁺,SF (0.16%)	(various)
²⁴¹Es	99	142	241.06859(25)#	4.3+2.4 −1.2 s^[3]	α	²³⁷Bk	3/2−#
²⁴²Es^[4]	99	143	242.06957(28)#	16.9(8) s	β⁺	²⁴²Cf	2+#
					α (41%)	²³⁸Bk
					β⁺, SF (1.5%)	(various)
²⁴³Es	99	144	243.06951(22)#	22.1(14) s	α (61%)	²³⁹Bk	(7/2+)
²⁴³Es	99	144	243.06951(22)#	22.1(14) s	β⁺? (39%)	²⁴³Cf	(7/2+)
^243mEs^{[n 7]}	50(50)# keV			>50# μs	IT?	²⁴³Es	3/2−#
					α?	²³⁹Bk
					β⁺?	²⁴³Cf
²⁴⁴Es	99	145	244.07088(20)#	37(4) s	β⁺ (95%)	²⁴⁴Cf	6+#
					α (5%)	²⁴⁰Bk
					β⁺, SF (0.011%)	(various)
²⁴⁵Es	99	146	245.07119(18)#	1.11(6) min	β⁺ (51%)	²⁴⁵Cf	(3/2−)
²⁴⁵Es	99	146	245.07119(18)#	1.11(6) min	α (49%)	²⁴¹Bk	(3/2−)
^245mEs^{[n 7]}	30(15)# keV			>50# μs	IT?	²⁴⁵Es	7/2+#
					α?	²⁴¹Bk
					β⁺?	²⁴⁵Cf
²⁴⁶Es	99	147	246.07281(10)	7.5(5) min	β⁺ (90.1%)	²⁴⁶Cf	4−#
					α (9.9%)	²⁴²Bk
					β⁺, SF (0.003%)	(various)
²⁴⁷Es	99	148	247.073622(21)	4.55(26) min	β⁺ (93%)	²⁴⁷Cf	(7/2+)
²⁴⁷Es	99	148	247.073622(21)	4.55(26) min	α (7%)	²⁴³Bk	(7/2+)
^247mEs^{[n 7]}	50(50)# keV			>20# μs	IT?	²⁴⁷Es	(3/2−)
					α?	²⁴³Bk
					β⁺	²⁴⁷Cf
²⁴⁸Es	99	149	248.07547(6)#	24(3) min	β⁺ (99.75%)	²⁴⁸Cf	2−#
					α (0.25%)	²⁴⁴Bk
					β⁺, SF (3.5×10⁻⁴%)	(various)
²⁴⁹Es	99	150	249.07641(3)#	102.2(6) min	β⁺ (99.43%)	²⁴⁹Cf	7/2+
²⁴⁹Es	99	150	249.07641(3)#	102.2(6) min	α (0.57%)	²⁴⁵Bk	7/2+
²⁵⁰Es	99	151	250.07861(11)#	8.6(1) h	β⁺	²⁵⁰Cf	6(+)
^250mEs^{[n 7]}	200(150)# keV			2.22(5) h	β⁺	²⁵⁰Cf	1(−)
²⁵¹Es	99	152	251.079991(6)	33(1) h	EC (99.5%)	²⁵¹Cf	3/2−
²⁵¹Es	99	152	251.079991(6)	33(1) h	α (0.5%)	²⁴⁷Bk	3/2−
^251mEs	8.4(10) keV			>200# μs	IT?	²⁵¹Es	(7/2+)
^251mEs	8.4(10) keV			>200# μs	EC?	²⁵¹Cf	(7/2+)
²⁵²Es	99	153	252.08298(5)	471.7(19) d	α (78%)	²⁴⁸Bk	(4+)
²⁵²Es	99	153	252.08298(5)	471.7(19) d	EC (22%)	²⁵²Cf	(4+)
²⁵³Es^{[n 8]}	99	154	253.0848212(13)	20.47(3) d	α	²⁴⁹Bk	7/2+
²⁵³Es^{[n 8]}	99	154	253.0848212(13)	20.47(3) d	SF (8.7×10⁻⁶%)	(various)	7/2+
^253mEs	106(4) keV			>10# μs	IT?	²⁵³Es	3/2−#
²⁵⁴Es	99	155	254.088024(3)	275.7(5) d	α^{[n 9]}	²⁵⁰Bk	7+
					β⁻ (1.74×10⁻⁴%)	²⁵⁴Fm
					SF (<3×10⁻⁶%)	(various)
^254mEs	80.4(11) keV			39.3(2) h	β⁻ (98%)	²⁵⁴Fm	2+
					IT (<3%)	²⁵⁴Es
					α (0.32%)	²⁵⁰Bk
					EC (0.076%)	²⁵⁴Cf
					SF (<0.045%)	(various)
²⁵⁵Es	99	156	255.090274(12)	39.8(12) d	β⁻ (92.0%)	²⁵⁵Fm	(7/2+)
					α (8.0%)	²⁵¹Bk
					SF (0.0041%)	(various)
²⁵⁶Es	99	157	256.09360(11)#	7.6 h	β⁻	²⁵⁶Fm	7+#
²⁵⁶Es	99	157	256.09360(11)#	7.6 h	β⁻, SF (0.002%)	(various)	7+#
^256mEs^{[n 7]}	0(100)# keV			25.4(12) min	β⁻	²⁵⁶Fm	0+#
²⁵⁷Es	99	158	257.09598(44)#	7.7(2) d	β⁻	²⁵⁷Fm	7/2+#
This table header & footer: view

^^mEs – Excitednuclear isomer.
^( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^Modes of decay:
EC: Electron capture

IT: Isomeric transition
SF: Spontaneous fission
^( ) spin value – Indicates spin with weak assignment arguments.
^^a ^b# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^^a ^b ^c ^d ^eOrder of ground state and isomer is uncertain.
^Most common isotope
^Theoretically capable of electron capture to²⁵⁴Cf^[1]

References

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^^a ^b ^c ^d ^eKondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021)."The NUBASE2020 evaluation of nuclear properties"(PDF).Chinese Physics C.45 (3): 030001.doi:10.1088/1674-1137/abddae.
^Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*".Chinese Physics C.45 (3): 030003.doi:10.1088/1674-1137/abddaf.
^Khuyagbaatar, J.; Albers, H. M.; Block, M.; Brand, H.; Cantemir, R. A.; Di Nitto, A.; Düllmann, Ch. E.; Götz, M.; Götz, S.; Heßberger, F. P.; Jäger, E.; Kindler, B.; Kratz, J. V.; Krier, J.; Kurz, N.; Lommel, B.; Lens, L.; Mistry, A.; Schausten, B.; Uusitalo, J.; Yakushev, A. (1 October 2020)."Search for Electron-Capture Delayed Fission in the New Isotope²⁴⁴Md".Physical Review Letters.125 (14): 142504.Bibcode:2020PhRvL.125n2504K.doi:10.1103/PhysRevLett.125.142504.PMID 33064498.S2CID 223546973.
^Khuyagbaatar, J.; Cantemir, R. A.; Düllmann, Ch. E.; Jäger, E.; Kindler, B.; Krier, J.; Kurz, N.; Lommel, B.; Schausten, B.; Yakushev, A. (2024-03-18). "Decay properties of the neutron-deficient isotope Es 242".Physical Review C.109 (3).arXiv:2408.01714.doi:10.1103/PhysRevC.109.034311.ISSN 2469-9985.

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean;Wapstra, Aaldert Hendrik (2003),"The NUBASE evaluation of nuclear and decay properties",Nuclear Physics A,729:3–128,Bibcode:2003NuPhA.729....3A,doi:10.1016/j.nuclphysa.2003.11.001
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean;Wapstra, Aaldert Hendrik (2003),"The NUBASE evaluation of nuclear and decay properties",Nuclear Physics A,729:3–128,Bibcode:2003NuPhA.729....3A,doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center."NuDat 3.0 database".Brookhaven National Laboratory.

- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.).CRC Handbook of Chemistry and Physics (85th ed.).Boca Raton, Florida:CRC Press.ISBN 978-0-8493-0485-9.

Isotopes of thechemical elements

Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Period	Hydrogen and alkali metals	Alkaline earth metals													Pnictogens	Chalcogens	Halogens	Noble gases
①	Isotopes § List H 1																	Isotopes § List He 2
②	Isotopes § List Li 3	Isotopes § List Be 4											Isotopes § List B 5	Isotopes § List C 6	Isotopes § List N 7	Isotopes § List O 8	Isotopes § List F 9	Isotopes § List Ne 10
③	Isotopes § List Na 11	Isotopes § List Mg 12											Isotopes § List Al 13	Isotopes § List Si 14	Isotopes § List P 15	Isotopes § List S 16	Isotopes § List Cl 17	Isotopes § List Ar 18
④	Isotopes § List K 19	Isotopes § List Ca 20	Isotopes § List Sc 21	Isotopes § List Ti 22	Isotopes § List V 23	Isotopes § List Cr 24	Isotopes § List Mn 25	Isotopes § List Fe 26	Isotopes § List Co 27	Isotopes § List Ni 28	Isotopes § List Cu 29	Isotopes § List Zn 30	Isotopes § List Ga 31	Isotopes § List Ge 32	Isotopes § List As 33	Isotopes § List Se 34	Isotopes § List Br 35	Isotopes § List Kr 36
⑤	Isotopes § List Rb 37	Isotopes § List Sr 38	Isotopes § List Y 39	Isotopes § List Zr 40	Isotopes § List Nb 41	Isotopes § List Mo 42	Isotopes § List Tc 43	Isotopes § List Ru 44	Isotopes § List Rh 45	Isotopes § List Pd 46	Isotopes § List Ag 47	Isotopes § List Cd 48	Isotopes § List In 49	Isotopes § List Sn 50	Isotopes § List Sb 51	Isotopes § List Te 52	Isotopes § List I 53	Isotopes § List Xe 54
⑥	Isotopes § List Cs 55	Isotopes § List Ba 56	Isotopes § List Lu 71	Isotopes § List Hf 72	Isotopes § List Ta 73	Isotopes § List W 74	Isotopes § List Re 75	Isotopes § List Os 76	Isotopes § List Ir 77	Isotopes § List Pt 78	Isotopes § List Au 79	Isotopes § List Hg 80	Isotopes § List Tl 81	Isotopes § List Pb 82	Isotopes § List Bi 83	Isotopes § List Po 84	Isotopes § List At 85	Isotopes § List Rn 86
⑦	Isotopes § List Fr 87	Isotopes § List Ra 88	Isotopes § List Lr 103	Isotopes § List Rf 104	Isotopes § List Db 105	Isotopes § List Sg 106	Isotopes § List Bh 107	Isotopes § List Hs 108	Isotopes § List Mt 109	Isotopes § List Ds 110	Isotopes § List Rg 111	Isotopes § List Cn 112	Isotopes § List Nh 113	Isotopes § List Fl 114	Isotopes § List Mc 115	Isotopes § List Lv 116	Isotopes § List Ts 117	Isotopes § List Og 118
⑧	Isotopes § List Uue 119	Isotopes § List Ubn 120

			Isotopes § List La 57	Isotopes § List Ce 58	Isotopes § List Pr 59	Isotopes § List Nd 60	Isotopes § List Pm 61	Isotopes § List Sm 62	Isotopes § List Eu 63	Isotopes § List Gd 64	Isotopes § List Tb 65	Isotopes § List Dy 66	Isotopes § List Ho 67	Isotopes § List Er 68	Isotopes § List Tm 69	Isotopes § List Yb 70
			Isotopes § List Ac 89	Isotopes § List Th 90	Isotopes § List Pa 91	Isotopes § List U 92	Isotopes § List Np 93	Isotopes § List Pu 94	Isotopes § List Am 95	Isotopes § List Cm 96	Isotopes § List Bk 97	Isotopes § List Cf 98	Isotopes § List Es 99	Isotopes § List Fm 100	Isotopes § List Md 101	Isotopes § List No 102

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EC:	Electron capture
IT:	Isomeric transition
SF:	Spontaneous fission