metallic element,
metal any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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Wiktionary
Substantiv
europium -
A metallic chemical element symbol Eu with an atomic number of 63.
Wikipedia
Europium is a chemical element with the symbol Eu and atomic number 63. It was named after the continent of Europe.
OmegaWiki Dictionary
Ω
europium Chemical element with symbol Eu and atomic number 63, silvery white lanthanide.