A silvery, soft, ductile metallic element that occurs chiefly in columbite-tantalite and is used in steel alloys, arc welding, and superconductivity research. Atomic number 41; atomic weight 92.906; melting point 2,468°C; boiling point 4,927°C; specific gravity 8.57; valence 2, 3, 5. See Table at element.
a metallic substance element (icon Nb) with an atomic range 41.
The chemical element of atomic quantity 41. Chemical representation Nb. Atomic body weight 92.91. Previously called columbium. See additionally columbium.
Chemical symbolization, Nb; atomic fat, 94. A metal of steel-gray shade and brilliant luster.
a soft gray ductile metallic factor used in alloys; occurs in niobite; formerly called columbium