Einsteinium: Difference between revisions
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imported>David Yamakuchi m (Anyone that knows what group, period, block, or oxidation state we should claim for this, just chime in! :=)) |
imported>Howard C. Berkowitz No edit summary |
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It belongs to the class of elements called [[transuranic element]]s whose atomic number are higher than 92, the atomic number of [[uranium]]. | It belongs to the class of elements called [[transuranic element]]s whose atomic number are higher than 92, the atomic number of [[uranium]]. | ||
Formally it was named for [[Albert Einstein]], although it was initially called Pandamonium. | Formally it was named for [[Albert Einstein]], although it was initially called Pandamonium. The [[Operation Ivy#Ivy Mike|Ivy Mike]] weapons test, directed by the Panda Committee, <ref>letter by Eric Evans in the Economist (April 19th. 1997, p.8)</ref>, produced the 20-day <sup>253E</sup> isotope in the fallout. Elements 99 and 100 (einsteinium and [[fermium]]) were found in debris brought back from the first H-bomb test in the Pacific by [[Al Ghiorso]] and co-workers at [[Berkeley]] in December 1952<ref>http://www.lbl.gov/today/2005/Jul/11-Mon/ghiobio-jump.html</ref><ref>{{citation | ||
| title = Einsteinium | | title = Einsteinium | ||
| url = http://periodic.lanl.gov/elements/99.html | | url = http://periodic.lanl.gov/elements/99.html | ||
Revision as of 12:20, 10 May 2010
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Einsteinium (chemical symbol Es) is a chemical element with atomic number 99. It belongs to the class of elements called transuranic elements whose atomic number are higher than 92, the atomic number of uranium.
Formally it was named for Albert Einstein, although it was initially called Pandamonium. The Ivy Mike weapons test, directed by the Panda Committee, [1], produced the 20-day 253E isotope in the fallout. Elements 99 and 100 (einsteinium and fermium) were found in debris brought back from the first H-bomb test in the Pacific by Al Ghiorso and co-workers at Berkeley in December 1952[2][3]
References
- ↑ letter by Eric Evans in the Economist (April 19th. 1997, p.8)
- ↑ http://www.lbl.gov/today/2005/Jul/11-Mon/ghiobio-jump.html
- ↑ "Einsteinium", Los Alamos National Laboratory