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1. (n.) einsteinium
a transuranic element.
Etymology: (1950–55; after Albert Einstein ; see -ium2)
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| Definition of 'Einsteinium' |
Princeton's WordNet |
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1. (noun) einsteinium, Es, E, atomic number 99
a radioactive transuranic element produced by bombarding plutonium with neutrons
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| Definition of 'Einsteinium' |
U.S. National Library of Medicine |
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1. Einsteinium
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.
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