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polonium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Polonium \Po*lo"ni*um\, n. [NL. So named after Poland, in L. form Polonia, one of the discoverers being a Pole.] (Chem.) A supposed new element, a radioactive substance discovered by M. and MMe. Curie in pitchblende. It is closely related chemically to bismuth. It emits only alpha rays and is perhaps identical with radium F. From WordNet r 1.6 [wn]: polonium n : a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor [syn: {Po}, {atomic number 84}] From Elements database 20001107 [elements]: polonium Symbol: Po Atomic number: 84 Atomic weight: (210) Rare radioactive metallic element, belongs to group 16 of the periodic table. Over 30 known isotopes exist, the most of all elements. Po-209 has a half-life of 103 years. Possible uses in heating spacecraft. Discovered by Marie Curie in 1898 in a sample of pitchblende.
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