[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki12\/isotopes-of-einsteinium-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki12\/isotopes-of-einsteinium-wikipedia\/","headline":"Isotopes of einsteinium – Wikipedia","name":"Isotopes of einsteinium – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Nuclides with atomic number of 99 but with different mass numbers Einsteinium (99Es)","datePublished":"2020-01-10","dateModified":"2020-01-10","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki12\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki12\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki12\/isotopes-of-einsteinium-wikipedia\/","wordCount":2503,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Nuclides with atomic number of 99 but with different mass numbersEinsteinium (99Es) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be discovered (in nuclear fallout from the Ivy Mike H-bomb test) was 253Es in 1952. There are 18 known radioisotopes from 240Es to 257Es, 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.       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4List of isotopes[edit]Nuclide[n 1]ZNIsotopic mass (Da)[n 2][n 3]Half-lifeDecaymode[n 4]DaughterisotopeSpin andparity[n 5][n 6]Excitation energy[n 6]240Es99141240.06892(43)#6(2)\u00a0s[2]\u03b1236Bk\u03b2+ (rare)240Cf241Es99142241.06854(24)#10(5)\u00a0s[8(+6\u22125)\u00a0s]\u03b1237Bk(3\/2\u2212)\u03b2+ (rare)241Cf242Es99143242.06975(35)#13.5(25)\u00a0s\u03b1 (99.94%)238Bk\u03b2+, SF (.6%)(various)\u03b2+ (rare)242Cf243Es99144243.06955(25)#21(2)\u00a0s\u03b2+ (70%)243Cf3\/2\u2212#\u03b1 (30%)239Bk244Es99145244.07088(20)#37(4)\u00a0s\u03b2+ (94.69%)244Cf\u03b1 (5.3%)240Bk\u03b2+, SF (.01%)(various)245Es99146245.07132(22)#1.1(1)\u00a0min\u03b2+ (60%)245Cf(3\/2\u2212)\u03b1 (40%)241Bk246Es99147246.07290(24)#7.7(5)\u00a0min\u03b2+ (90.1%)246Cf4\u2212#\u03b1 (9.9%)242Bk\u03b2+, SF (.003%)(various)247Es99148247.07366(3)#4.55(26)\u00a0min\u03b2+ (93%)247Cf7\/2+#\u03b1 (7%)243BkSF (9\u00d710\u22125%)(various)248Es99149248.07547(6)#27(5)\u00a0min\u03b2+ (99.75%)248Cf2\u2212#, 0+#\u03b1 (.25%)244Bk\u03b2+, SF (3\u00d710\u22125%)(various)249Es99150249.07641(3)#102.2(6)\u00a0min\u03b2+ (99.43%)249Cf7\/2+\u03b1 (.57%)245Bk250Es99151250.07861(11)#8.6(1)\u00a0h\u03b2+ (97%)250Cf(6+)\u03b1 (3%)246Bk250mEs200(150)#\u00a0keV2.22(5)\u00a0hEC (99%)250Cf1(\u2212)\u03b1 (1%)246Bk251Es99152251.079992(7)33(1)\u00a0hEC (99.51%)251Cf(3\/2\u2212)\u03b1 (.49%)247Bk252Es99153252.08298(5)471.7(19)\u00a0d\u03b1 (76%)248Bk(5\u2212)EC (24%)252Cf\u03b2\u2212 (.01%)252Fm253Es[n 7]99154253.0848247(28)20.47(3)\u00a0d\u03b1249Bk7\/2+SF (8.7\u00d710\u22126%)(various)254Es99155254.088022(5)275.7(5)\u00a0d\u03b1250Bk(7+)EC (10\u22124%)254CfSF (3\u00d710\u22126%)(various)\u03b2\u2212 (1.74\u00d710\u22126%)254Fm254mEs84.2(25)\u00a0keV39.3(2)\u00a0h\u03b2\u2212 (98%)254Fm2+IT (3%)254Es\u03b1 (.33%)250BkEC (.078%)254CfSF (.0045%)(various)255Es99156255.090273(12)39.8(12)\u00a0d\u03b2\u2212 (92%)255Fm(7\/2+)\u03b1 (8%)251BkSF (.0041%)(various)256Es99157256.09360(11)#25.4(24)\u00a0min\u03b2\u2212256Fm(1+, 0\u2212)256mEs0(100)#\u00a0keV7.6 h\u03b2\u2212 (99.99%)256Fm(8+)\u03b2\u2212, SF (.002%)(various)257Es99158257.09598(44)#7.7(2)\u00a0d\u03b2\u2212257Fm7\/2+#\u03b1253BkThis table header & footer: ^ mEs\u00a0\u2013  Excited nuclear isomer.^ (\u2009)\u00a0\u2013  Uncertainty (1\u03c3) is given in concise form in parentheses after the corresponding last digits.^ #\u00a0\u2013  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:^ (\u2009) spin value\u00a0\u2013  Indicates spin with weak assignment arguments.^ a b #\u00a0\u2013  Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).^ Most common isotopeReferences[edit]Isotope masses from:Isotopic compositions and standard atomic masses from:“News & Notices: Standard Atomic Weights Revised”. International Union of Pure and Applied Chemistry. 19 October 2005.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\u2013128, Bibcode:2003NuPhA.729….3A, doi:10.1016\/j.nuclphysa.2003.11.001National Nuclear Data Center. “NuDat 2.x 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\u00a0ed.). Boca Raton, Florida: CRC Press. ISBN\u00a0978-0-8493-0485-9.     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