| 单词 | atomic number 92 |
| 释义 | atomic number 92 (extremely rare) n WORD FAMILY atomic number 92 n a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons Syn|Hypo|Hyper U, uranium uranium 235 a uranium isotope with mass number 235; capable of sustaining chain reactions uranium 238the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239 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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