fermium

fermium
fermium 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. Other istopes have been produced in nuclear reactors and by decay of other transuranic elements. --Handb. Ch. Phys. 61.

Syn: Fm. [WordNet 1.5]


The Collaborative International Dictionary of English. 2000.

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