Einsteinium is a synthetic element with the symbol Es and atomic number 99. It is the seventh transuranic element, and an actinide. Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952, and named after Albert Einstein. Its most common isotope einsteinium-253 (half life 20.47 days) is produced artific...Found on http://en.wikipedia.org/wiki/Einsteinium
<chemical> Einsteinium. A man-made radioactive actinide with atomic symbol es, atomic number 99, and atomic weight 252. Its known isotopes range in mass number from 243-246. Its valence can be +2 or +3. Einsteinium was originally discovered in the debris from a thermonuclear explosion in 1952. ... Chemical name: Einsteinium ... (12 Dec 1998) ...Found on http://www.encyclo.co.uk/local/20973
(Es) (īn-sti´ne-әm) a chemical element, atomic number 99, atomic weight 254.Found on http://www.encyclo.co.uk/local/21001
(Es), synthetic chemical element of the actinoid series of the periodic table, atomic number 99. Not occurring in nature, einsteinium (as the isotope ... [1 related articles]Found on http://www.britannica.com/eb/a-z/e/15
a radioactive transuranic element produced by bombarding plutonium with neutronsFound on https://www.encyclo.co.uk/local/20974
A synthetic, radioactive, metallic element of the actinide series. The isotope 253
Es was first identified in 1952 by G. R. Choppin and co-workers at the University of California at Berkeley; this was after it was found as a decay product of ...
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(Es) Type: Term Pronunciation: īn-stīn′ē-ŭm Definitions: 1. An artificially prepared transuranium element, atomic no. 99, atomic wt. 252.0; it has many isotopes, all of which are radioactive (252Es has the longest known half-life, 1.29 years).
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An artificial radioactive element found in the debris of an H bomb. Symbol Es
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einsteinium (īn'stī"nēum, īnstī'–) [for Albert Einstein], artificially produced radioactive chemical element; symbol Es; at. no. 99; mass no. of most stable isotope 252; m.p. about 860°C; b.p. and sp. gr. unknown; valence +2, +3. Einsteinium is a m...
Found on http://www.infoplease.com/ce6/sci/A0816893.html
Synthesized, radioactive, metallic element of the actinide series, atomic number 99, relative atomic mass 254.09. It was produced by the first thermonuclear explosion, in 1952, and discovered in fallout debris in the form of the isotope Es-253 (half-life 20 days). Its longest-lived isotope, Es-254, with a half-life of 276 days, ...
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[n] - a radioactive transuranic element produced by bombarding plutonium with neutrons
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