Adjacent Words

einsteinium definitions

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WordNet (r) 3.0 (2005)

n
1: a radioactive transuranic element produced by bombarding plutonium with neutrons [syn: einsteinium, Es, E, atomic number 99]

Merriam Webster's

noun Etymology: New Latin, from Albert Einstein Date: 1955 a radioactive element produced artificially — see element table

Dictionary of the Elements

einsteinium
Symbol: Es
Atomic number: 99
Atomic weight: (254)
Appearance is unknown, however it is most probably metallic and silver or gray in color. Radioactive metallic transuranic element belonging to the actinoids. Es-254 has the longest half-life of the eleven known isotopes at 270 days. First identified by Albert Ghiorso and associates in the debris of the 1952 hydrogen bomb explosion. In 1961 the first microgram quantities of Es-232 were separated. While einsteinium never exists naturally, if a sufficient amount was assembled, it would pose a radiation hazard.

Oxford Reference Dictionary

n. Chem. a transuranic radioactive metallic element produced artificially from plutonium. Usage: Symb.: Es. Etymology: A. Einstein, Ger.-Amer. physicist d. 1955