ein·stei·ni·um ( n-st n - m)n. Symbol Es A synthetic transuranic element first produced by neutron irradiation of uranium in a thermonuclear explosion and now usually produced in the laboratory by irradiating plutonium and other elements. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C. See Table at element. [After Albert Einstein.] |
einsteinium
Noun
Chem a radioactive metallic element artificially produced from plutonium Symbol: Es[after Albert Einstein, physicist]
| einsteinium (n-stn-m) 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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | einsteinium - a radioactive transuranic element produced by bombarding plutonium with neutrons metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
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