einsteinium (redirected from Element 99)

ein·stei·ni·um  (n-stn-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.

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[After Albert Einstein.]

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einsteinium [aɪnˈstaɪnɪəm]

n

(Chemistry / Elements & Compounds) a metallic transuranic element artificially produced from plutonium. Symbol: Es; atomic no.: 99; half-life of most stable isotope, ²⁵²Es: 276 days

[New Latin, named after Albert Einstein (1879-1955), German-born US physicist and mathematician]

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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.

Thesaurus

Noun

1.

einsteinium - a radioactive transuranic element produced by bombarding plutonium with neutrons atomic number 99, Es, E 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.