meitnerium

meit·ner·i·um  (mt-nûr-m)

n. Symbol Mt

An artificially produced radioactive element with atomic number 109 that has known isotopes with mass numbers ranging from 265 to 279. The isotope with the longest confirmed half-life (0.7 seconds) is Mt 268. Also called unnilennium. See Table at element.

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[After Lise Meitner.]

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meitnerium [ˈmaɪtnɪərɪəm]

n

(Chemistry / Elements & Compounds) a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Mt; atomic no.: 109

[named after Lise Meitner (1878-1968), Austrian nuclear physicist]

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meitnerium  (mt-nûr-m)

Symbol Mt

A synthetic, radioactive element that is produced by bombarding bismuth with iron ions. Its most long-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Atomic number 109. See Periodic Table.

Thesaurus

Noun

1.

meitnerium - a radioactive transuranic element atomic number 109, element 109, Mt chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter