atomic number 73

Noun

atomic number 73 - a hard gray lustrous metallic element that is highly corrosion-resistant; occurs in niobite and fergusonite and tantalite

Ta, tantalum

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.

fergusonite - a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals

columbite, niobite - a black mineral that is an ore of niobium and tantalum

tantalite - a mineral consisting of tantalum oxide of iron and manganese that occurs with niobite or in coarse granite; an ore of tantalum

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