einsteinium

[ahyn-stahy-nee-uhm]
noun Chemistry, Physics.
a transuranic element. Symbol: Es; atomic number: 99.

Origin:
1950–55; named after Albert Einstein; see -ium

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World English Dictionary
einsteinium (aɪnˈstaɪnɪəm)
 
n
a metallic transuranic element artificially produced from plutonium. Symbol: Es; atomic no: 99; half-life of most stable isotope, 252Es: 276 days
 
[C20: New Latin, named after Albert Einstein]

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Medical Dictionary

einsteinium ein·stein·i·um (īn-stī'nē-əm)
n.
Symbol Es
A radioactive transuranic element synthesized by neutron irradiation of plutonium or other elements. Its longest-lived isotope is Es 254 with a half-life of 275 days. Atomic number 99; melting point 860°C.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
einsteinium   (īn-stī'nē-əm)  Pronunciation Key 
Symbol Es
A synthetic, radioactive metallic element of the actinide series that is usually produced by bombarding plutonium or another element with neutrons. It was first isolated in a region near the explosion site of a hydrogen bomb. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C. See Periodic Table.
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Encyclopedia Britannica
Encyclopedia

einsteinium

(Es), synthetic chemical element of the actinoid series of the periodic table, atomic number 99. Not occurring in nature, einsteinium (as the isotope einsteinium-253), produced by intense neutron irradiation of uranium-238, was identified in December 1952 by Albert Ghiorso and co-workers at Berkeley, Calif., in debris taken from the first thermonuclear or hydrogen-bomb explosion, in the South Pacific (November 1952).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The elements curium, einsteinium, and fermium were named after famous nuclear physicists.
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