Found 2 items, similar to einsteinium.
English → English (WordNet) Definition: einsteinium einsteinium n : a radioactive transuranic element produced by bombarding plutonium with neutrons [syn: Es, E, atomic number 99 ]
English → English (gcide) Definition: einsteinium Es \Es\ n. the chemical symbol for einsteinium, a transuranic element with atomic number 99. The atomic weight of the longest-lived isotope, with a half-life of 276 days, is 254. The first isotope discovered, having atomic weight 253 and a half-life of 20 days, was recognized in 1952 in the debris from a hydrogen bomb test. As much as 3 micrograms of einsteinium were produced by a complex process involving long irradiation of plutonium isotopes in nuclear reactors. Its chemical properties are those of a trivalent actinide element. --HCP61 Syn: einsteinium, atomic number 99. [WordNet 1.5 +PJC]