atomic number 91

Noun
  1. A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead (synset 114675887)
    is a type of: 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.
    same as: pa, protactinium, protoactinium

Found on Word Lists

Other Searches