Getting My real element periodic table To Work
Getting My real element periodic table To Work
Some 238U atoms, however, could absorb two extra neutrons (for a total of 17), leading to 255Es, in addition to in the 255Fm isotope of another new element, fermium.  The discovery of the new elements and the associated new data on multiple neutron capture were originally kept secret on the orders of the U.S. military until 1955 because of Cold War tensions and rivalry with Soviet Union in nuclear technologies.  However, the rapid capture of so many neutrons would provide needed direct experimental confirmation of the so-called r-process multiple neutron absorption needed to explain the cosmic nucleosynthesis (production) of certain heavy chemical elements (heavier than nickel) in supernova explosions, before beta decay. Such a process is needed to explain the occurrence of many stable elements in the universe. 
Meanwhile, isotopes of element 99 (as well as of new element 100, fermium) were produced in the Berkeley and Argonne labs, in a nuclear reaction between nitrogen-14 and uranium-238, and later by intense neutron irradiation of plutonium or californium:
Einsteinium was discovered as a part of the debris of the first hydrogen bomb explosion in 1952. Its most frequent isotope einsteinium-253 (half-life 20.47 times ) is produced artificially from corrosion of californium-253 in a couple of committed hemorrhagic atomic reactors with a total return on the order of one milligram each year. The reactor synthesis is followed by a complicated process of separating einsteinium-253 from other actinides and products of the decay. Other isotopes are synthesized in various laboratories, but in much smaller amounts, by bombarding heavy actinide elements with light ions. Owing to the small amounts of generated einsteinium and the short half-life of its most easily produced isotope, there are currently almost no practical applications for it beyond basic scientific research. Specifically, einsteinium was used to synthesize, for the first time, 17 atoms of the new element mendelevium in 1955.
).  Larger quantities of radioactive material were later isolated from coral debris of the atoll, which were sent to the U.S. The separation of suspected new elements was completed in the presence of a citric acid/ammonium buffer solution in a weakly acidic medium (pH ≈ 3.5), using ion exchange at elevated temperatures; fewer than 200 atoms of einsteinium were recovered in the end.  Nevertheless, element 99 (einsteinium), specifically its 253Es isotope, might be detected via its feature high-energy alpha decay at 6.6 MeV.  It was produced by the capture of 15 neutrons by uranium-238 nuclei followed by seven beta-decays, and had a half-life of 20.5 days. Neutron capture initially raised the mass number without changing the atomic number of the nuclide, along with the concomitant beta-decays resulted in a gradual increase in the atomic number:
At the time, the multiple neutron absorption was thought to be an extremely rare process, but the identification of 244
, which could only have formed by the absorption of six neutrons with a uranium-238 nucleus followed by two beta decays.
displaystyle ce ^238_92U ->[ce +15n][6 beta^-] ^253_98Cf ->[beta^-] ^253_99Es
Like all synthetic transuranic elements, isotopes of einsteinium are very radioactive and are considered highly dangerous to health on ingestion. 
In their discovery of the elements 99 and 100, the American teams had collaborated with a group in the Nobel Institute for Physics, Stockholm, Sweden. In late 1953 -- early 1954, the Swedish group succeeded in the synthesis of light isotopes of element 100, in particular 250Fm, by bombarding uranium with oxygen nuclei. These results were also published in 1954.  But the priority of the Berkeley group was generally recognized, as its books preceded the Swedish post, and they were based on the previously undisclosed outcomes of the 1952 thermonuclear explosion; thus the Berkeley team was given the privilege to name the new elements. As the campaign which had led to the design of Ivy Mike was codenamed Project PANDA, element 99 was jokingly nicknamed"Pandamonium" but the official titles suggested by the Berkeley group originated from two prominent scientists, Albert Einstein and Enrico Fermi:"We suggest for the title for the element with the atomic number 99, einsteinium (symbol E) after Albert Einstein and for the title for the element with atomic number 100, fermium (symbol Fm), after Enrico Fermi."  Both Einstein and Fermi died between the time the names were originally proposed and when they were announced. The discovery of the new elements was declared by Albert Ghiorso in the first Geneva Atomic Conference held on 8--20 August 1955. 
Indicated that still more neutrons could have been captured by the uranium nuclei, thereby producing new elements heavier than californium. 
Einsteinium was first identified in December 1952 by Albert Ghiorso and co-workers at the University of California, Berkeley in collaboration with the Argonne and Los Alamos National Laboratories, in the fallout from the Ivy Mike nuclear test.  Initial evaluation of the debris from the explosion had revealed the Creation of a new isotope of plutonium, 244
The element was named after Albert Einstein.
Einsteinium is a soft, silvery, paramagnetic metal. Its chemistry is typical of the late actinides, with a preponderance of the +3 oxidation state; the +2 oxidation state is also accessible, especially in solids. The high radioactivity of einsteinium-253 produces a visible glow and rapidly damages its crystalline metallic lattice, with released heat more info of about 1000 watts per gram. Difficulty in studying its properties is due to einsteinium-253's decay to berkelium-249 and then californium-249 at a speed of about 3% per day. The isotope of einsteinium with the longest half-life, einsteinium-252 (half-life 471.7 times ) would be more suitable for investigation of physical attributes, but it has proven far more difficult to make and is available only in minute quantities, and not in bulk.  Einsteinium is the element with the greatest atomic number that has been observed in macroscopic quantities in its pure form, and this was the common short-lived isotope einsteinium-253. 
Ghiorso and co-workers analyzed filter papers which had been flown through the burst cloud on airplanes (the same sampling technique that was used to discover 244
These results were published in several articles in 1954 with the disclaimer that these weren't the first studies that had been completed on the components.  The Ivy Mike outcomes were declassified and published in 1955. 
Einsteinium is a synthetic element with the symbol Es and atomic number 99. Einsteinium is a member of the actinide series and it's the seventh transuranic element. It is named to honor Albert Einstein.
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