atomic number 21

Noun
  1. A white trivalent metallic element;
    Sometimes classified in the rare earth group;
    Occurs in the Scandinavian mineral thortveitite (synset 114678010)
    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.
    substance meronym: thortveitite - a mineral consisting of scandium yttrium silicate; a source of scandium
    same as: sc, scandium

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