einsteinium
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.

Elements of periodic system. 2013.

  • Einsteinium — (pronEng|aɪnˈstaɪniəm) is a metallic synthetic element. On the periodic table, it is represented by the symbol Es and atomic number 99. It is the seventh transuranic element, and seventh in the series of Actinides. It was named in honor of Albert …   Wikipedia

  • einsteinium — [ ɛnstɛnjɔm ] n. m. • 1955; de Einstein, n. pr. ♦ Chim., phys. Élément atomique, onzième de la série des actinides (Es; no at. 99). L einsteinium est préparé dans un réacteur à haut flux par irradiation du plutonium. ● einsteinium nom masculin… …   Encyclopédie Universelle

  • Einsteinium — discovered in the debris of a 1952 U.S. nuclear test in the Pacific, named 1955 for physicist Albert Einstein (1879 1955) …   Etymology dictionary

  • einsteinium — ☆ einsteinium [īn stīn′ē əm ] n. [ModL, after EINSTEIN2 Albert (in honor of his theoretical studies of mass and energy) + IUM: so named (1955) by A. Ghiorso and co workers, who identified it] a radioactive, metallic chemical element, one of the… …   English World dictionary

  • Einsteinium — Eigenschaften …   Deutsch Wikipedia

  • Einsteinium — Pour les articles homonymes, voir Einstein (homonymie). Einsteinium Californium ← Ein …   Wikipédia en Français

  • einsteinium — /uyn stuy nee euhm/, n. Chem., Physics. a transuranic element. Symbol: Es; at. no.: 99. [1950 55; named after Albert EINSTEIN; see IUM] * * * ▪ chemical element  (Es), synthetic chemical element of the actinoid series of the periodic table,… …   Universalium

  • 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… …   The Collaborative International Dictionary of English

  • Einsteinium — einšteinis statusas T sritis fizika atitikmenys: angl. einsteinium vok. Einsteinium, n rus. эйнштейний, m pranc. einsteinium, m …   Fizikos terminų žodynas

  • einsteinium — einšteinis statusas T sritis fizika atitikmenys: angl. einsteinium vok. Einsteinium, n rus. эйнштейний, m pranc. einsteinium, m …   Fizikos terminų žodynas