atomic number 90

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 sandsthorium, Thmetal, 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 228monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and ceriumthorite - a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite