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English Dictionary: atomic number 90 by the DICT Development Group
1 result for atomic number 90
From WordNet (r) 3.0 (2006) [wn]:
atomic number 90
n
  1. 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
    Synonym(s): thorium, Th, atomic number 90
No guarantee of accuracy or completeness!
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