HyperDic: atomic_number_90

English > 1 sense of the expression atomic number 90:
NOUNsubstanceatomic number 90, thorium, Tha soft silvery-white tetravalent radioactive metallic element
English > atomic number 90: 1 sense > noun 1, substance
MeaningA 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.
Synonymsthorium, Th
Narrowerthorium-228, radiothoriumradioactive isotope of thorium with mass number 228
Broadermetallic element, metalAny of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
Substance ofmonaziteA reddish-brown mineral containing rare earth metals
thoriteA radioactive mineral consisting of thorium silicate
Spanishnúmero atómico 90, Th, tori, torio
Catalannúmero atòmic 90, Th, tori

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