atomic number 73

Thesaurus

Noun

1.atomic number 73 - a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantaliteTa, tantalummetal, 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 mineralscolumbite, niobite - a black mineral that is an ore of niobium and tantalumtantalite - a mineral consisting of tantalum oxide of iron and manganese that occurs with niobite or in coarse granite; an ore of tantalum