单词 | atomic number 27 |
释义 | atomic number 27 (extremely rare) n WORD FAMILY atomic number 27 n a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition Syn|Hypo|Hyper Co, cobalt cobalt 60 a radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy metal, metallic element any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
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