Radioactive element, artificially prepared in 1955, atomic no. 100, atomic wt. 257.095; 257Fm has the longest known half-life (100.5 days) of this transuranium element. [E. Fermi, It.-U.S. physicist and Nobel laureate, 1901–1954]

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fer·mi·um 'fer-mē-əm, 'fər- n a radioactive metallic element artificially produced (as by bombardment of plutonium with neutrons) symbol Fm see ELEMENT (table)

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fer·mi·um (Fm) (furґme-əm) [Enrico Fermi, Italian physicist, 1901–1954; winner of the Nobel prize for physics in 1938] the chemical element number 100, atomic weight 253, originally discovered in debris from a thermonuclear explosion in 1952.

Medical dictionary. 2011.

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  • fermium — [ fɛrmjɔm ] n. m. • 1957; de Fermi, n. pr. (→ fermion) ♦ Chim., phys. Élément artificiel radioactif (Fm; no at. 100; m. at. [des isotopes] 248 à 256), huitième élément transuranien découvert dans la série des actinides. ● fermium nom masculin (de …   Encyclopédie Universelle

  • fermium — n. the transuranic element of atomic number 100; symbol Fm. The atomic weight of the most stable isotope, having a half life of about 80 days, is 257. The first isotope, Fm255 was discovered in 1952 in the debris of a thermonuclear explosion.… …   The Collaborative International Dictionary of English

  • fermium — Symbol: Fm Atomic number: 100 Atomic weight: (253) Radioactive metallic transuranic element, belongs to the actinoids. Ten known isotopes, most stable is Fm 257 with a half life of 10 days. First identified by Albert Ghiorso and associates in the …   Elements of periodic system

  • Fermium — discovered in the debris of a 1952 U.S. nuclear test in the Pacific, named 1955 for Italian born U.S. physicist Enrico Fermi (1901 1954) …   Etymology dictionary

  • fermium — ☆ fermium [fer′mē əm, fʉr′mē əm ] n. [ModL: so named (1955) by A. Ghiorso and co workers, after FERMI Enrico (in honor of his studies in nuclear physics) + IUM] a radioactive, metallic chemical element, one of the actinides, produced by intense… …   English World dictionary

  • Fermium — Not to be confused with Ferrum , the Latin name for Iron. einsteinium ← fermium → mendelevium …   Wikipedia

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  • fermium — /ferr mee euhm/, n. Chem., Physics. a transuranic element. Symbol: Fm; at. no.: 100. [1950 55; named after E. FERMI; see IUM] * * * ▪ chemical element  (Fm), synthetic chemical element of the actinoid series of the periodic table, atomic number… …   Universalium

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  • fermium — fermis statusas T sritis fizika atitikmenys: angl. fermium vok. Fermium, n rus. фермий, m pranc. fermium, m …   Fizikos terminų žodynas

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