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| | พอโลเนียม | (n) polonium, Syn. ธาตุพอโลเนียม, Example: มารี คูรี และปิแอร์ คูรีแยกธาตุกัมมันตรังสีออกจากยูเรเนียมได้สองธาตุ คือ พอโลเนียม และ เรเดียม, Thai Definition: ธาตุกัมมันตรังสีชนิดหนึ่ง มีสถานะเป็นของแข็ง, Notes: (อังกฤษ) |
| | พอโลเนียม | [phølōnīem] (n) EN: polonium FR: polonium [ m ] |
| | | 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 |
| | Polonium | n. [ NL. So named after Poland, in L. form Polonia, one of the discoverers being a Pole. ] (Chem.) A radioactive chemical element, discovered by M. and MMe. Curie in pitchblende, and originally called radium F. It has atomic number 84 and an atomic weight of 210. It is a very rare natural element, having an abundance in uranium ores only 0.2% that of radium. It is closely related chemically to bismuth. It emits only alpha rays, and has a half-life of 138 days. It is thus more unstable than radium, and a milligram of polonium emits as many alpha particles as 5 grams of radium. Twenty-seven isotopes are known, with atomic masses from 192 to 218. At present a more practical method of preparation than isolation from ores is the preparation by neutron bombardment of bismuth in a nuclear reactor, and it may be obtained commercially by users having an appropriate permit. [ HBCF61 ] [ Webster 1913 Suppl. +PJC ] |
| | 钋 | [pō, ㄆㄛ, 钋 / 釙] polonium Po 釙|钋, metalloid, atomic number 84, See also: 釙 #43,144 [Add to Longdo] | | 类金属 | [lèi jīn shǔ, ㄌㄟˋ ㄐㄧㄣ ㄕㄨˇ, 类 金 属 / 類 金 屬] metalloid (chem.), element with properties intermediate between metals and nonmetals, usually taken to include Boron B 硼, Silicon Si 硅, Germanium Ge 鍺|锗, Arsenic As 砷, Antimony Sb 銻|锑, Tellurium Te 碲, Polonium Po 釙|钋 (sometimes also the halogen Astatine A, See also: 硼, 硅, 鍺, 锗, 砷, 銻, 锑, 碲, 釙, 钋, 砹 [Add to Longdo] |
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