atomic number 90
Also found in: Thesaurus.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Switch to new thesaurus
Noun | 1. | atomic number 90 - a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands 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. radiothorium, thorium-228 - radioactive isotope of thorium with mass number 228 monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium thorite - a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite |
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.