undecaoxide
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Some properties of the rare-earth elements (values recommended by Ames Laboratory) part I — ▪ Table Some properties of the rare earth elements (values recommended by Ames Laboratory) part I scandium yttrium lanthanum cerium atomic number 21 39 57 58 atomic weight 44.956 88.905 138.91 140.12 colour of element silvery silvery silvery… … Universalium