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  • niobium - Reference Center

    Niobium, metallic chemical element; symbol Nb; at. no. 41; at. wt. 92.9064; m.p. about 2,468°C; b.p. 4,742°C; sp. gr. 8.57 at 20°C; valence +2, +3, +4, or +5. Niobium is a rare, soft, malleable, ductile, gray-white metal with a body-centered cubic... more

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