JanitorAI· 1 cards· 0 lorebooks· active Oct 30, 2026–Oct 30, 2026
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Niobium is a chemical element; it has symbol Nb (formerly columbium, Cb) and atomic number 41. It is a light grey, crystalline, and ductile transition metal. Pure niobium has a Mohs hardnessrating similar to pure…
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