Isotopes of einsteinium

Einsteinium (Es) is a synthetic element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be discovered (in nuclear fallout from an H-bomb test) was ²⁵³Es in 1952. There are 19 known radioisotopes from ²⁴⁰Es to ²⁵⁸Es, and 3 nuclear isomers (^250mEs, ^254mEs, and ^256mEs). The longest-lived isotope is ²⁵²Es with a half-life of 471.7 days, or around 1.293 years.

Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)^[1]^{[n 1]}	daughter isotope(s)	nuclear spin
nuclide symbol	excitation energy			half-life	decay mode(s)^[1]^{[n 1]}	daughter isotope(s)	nuclear spin
²⁴⁰Es	99	141	240.06892(43)#	1# s	α	²³⁶Bk
²⁴⁰Es	99	141	240.06892(43)#	1# s	β⁺ (rare)	²⁴⁰Cf
²⁴¹Es	99	142	241.06854(24)#	10(5) s [8(+6−5) s]	α	²³⁷Bk	(3/2−)
²⁴¹Es	99	142	241.06854(24)#	10(5) s [8(+6−5) s]	β⁺ (rare)	²⁴¹Cf	(3/2−)
²⁴²Es	99	143	242.06975(35)#	13.5(25) s	α (99.94%)	²³⁸Bk
					β⁺, SF (.6%)	(various)
					β⁺ (rare)	²⁴²Cf
²⁴³Es	99	144	243.06955(25)#	21(2) s	β⁺ (70%)	²⁴³Cf	3/2−#
²⁴³Es	99	144	243.06955(25)#	21(2) s	α (30%)	²³⁹Bk	3/2−#
²⁴⁴Es	99	145	244.07088(20)#	37(4) s	β⁺ (94.69%)	²⁴⁴Cf
					α (5.3%)	²⁴⁰Bk
					β⁺, SF (.01%)	(various)
²⁴⁵Es	99	146	245.07132(22)#	1.1(1) min	β⁺ (60%)	²⁴⁵Cf	(3/2−)
²⁴⁵Es	99	146	245.07132(22)#	1.1(1) min	α (40%)	²⁴¹Bk	(3/2−)
²⁴⁶Es	99	147	246.07290(24)#	7.7(5) min	β⁺ (90.1%)	²⁴⁶Cf	4−#
					α (9.9%)	²⁴²Bk
					β⁺, SF (.003%)	(various)
²⁴⁷Es	99	148	247.07366(3)#	4.55(26) min	β⁺ (93%)	²⁴⁷Cf	7/2+#
					α (7%)	²⁴³Bk
					SF (9×10⁻⁵%)	(various)
²⁴⁸Es	99	149	248.07547(6)#	27(5) min	β⁺ (99.75%)	²⁴⁸Cf	2−#,0+#
					α (.25%)	²⁴⁴Bk
					β⁺, SF (3×10⁻⁵%)	(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 (.57%)	²⁴⁵Bk	7/2+
²⁵⁰Es	99	151	250.07861(11)#	8.6(1) h	β⁺ (97%)	²⁵⁰Cf	(6+)
²⁵⁰Es	99	151	250.07861(11)#	8.6(1) h	α (3%)	²⁴⁶Bk	(6+)
^250mEs	200(150)# keV			2.22(5) h	EC (99%)	²⁵⁰Cf	1(−)
^250mEs	200(150)# keV			2.22(5) h	α (1%)	²⁴⁶Bk	1(−)
²⁵¹Es	99	152	251.079992(7)	33(1) h	EC (99.51%)	²⁵¹Cf	(3/2−)
²⁵¹Es	99	152	251.079992(7)	33(1) h	α (.49%)	²⁴⁷Bk	(3/2−)
²⁵²Es	99	153	252.08298(5)	471.7(19) d	α (76%)	²⁴⁸Bk	(5−)
					EC (24%)	²⁵²Cf
					β⁻ (.01%)	²⁵²Fm
²⁵³Es^{[n 2]}	99	154	253.0848247(28)	20.47(3) d	α	²⁴⁹Bk	7/2+
²⁵³Es^{[n 2]}	99	154	253.0848247(28)	20.47(3) d	SF (8.7×10⁻⁶%)	(various)	7/2+
²⁵⁴Es	99	155	254.088022(5)	275.7(5) d	α	²⁵⁰Bk	(7+)
					EC (10⁻⁴%)	²⁵⁴Cf
					SF (3×10⁻⁶%)	(various)
					β⁻ (1.74×10⁻⁶%)	²⁵⁴Fm
^254mEs	84.2(25) keV			39.3(2) h	β⁻ (98%)	²⁵⁴Fm	2+
					IT (3%)	²⁵⁴Es
					α (.33%)	²⁵⁰Bk
					EC (.078%)	²⁵⁴Cf
					SF (.0045%)	(various)
²⁵⁵Es	99	156	255.090273(12)	39.8(12) d	β⁻ (92%)	²⁵⁵Fm	(7/2+)
					α (8%)	²⁵¹Bk
					SF (.0041%)	(various)
²⁵⁶Es	99	157	256.09360(11)#	25.4(24) min	β⁻	²⁵⁶Fm	(1+,0−)
^256mEs	0(100)# keV			7.6 h	β⁻ (99.99%)	²⁵⁶Fm	(8+)
^256mEs	0(100)# keV			7.6 h	β⁻, SF (.002%)	(various)	(8+)
²⁵⁷Es	99	158	257.09598(44)#	7.7(2) d	β⁻	²⁵⁷Fm	7/2+#
²⁵⁷Es	99	158	257.09598(44)#	7.7(2) d	α	²⁵³Bk	7/2+#
²⁵⁸Es	99	159	258.09952(32)#	3# min

↑ Abbreviations:
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission
↑ Most common isotope

Notes

Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

References

↑ "Universal Nuclide Chart". nucleonica. (registration required (help)).

Isotope masses from:
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.
Isotopic compositions and standard atomic masses from:
- J. R. de Laeter; J. K. Böhlke; P. De Bièvre; H. Hidaka; H. S. Peiser; K. J. R. Rosman; P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051. Lay summary.
Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001.
- National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005. Check date values in: |access-date= (help)
- N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9.

Isotopes of californium	Isotopes of einsteinium	Isotopes of fermium
Table of nuclides

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

		57 La	58 Ce	59 Pr	60 Nd	61 Pm	62 Sm	63 Eu	64 Gd	65 Tb	66 Dy	67 Ho	68 Er	69 Tm	70 Yb	71 Lu
		89 Ac	90 Th	91 Pa	92 U	93 Np	94 Pu	95 Am	96 Cm	97 Bk	98 Cf	99 Es	100 Fm	101 Md	102 No	103 Lr
Table of nuclides Categories: Isotopes Tables of nuclides Metastable isotopes Isotopes by element

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