Niobium. melting point: 2,475 ° C ± 10 ° C boiling point: ∼ 4,740 ° C density: 8.57g/cm 3 at room temperature most common ions: Nb 3+. Niobium metal is typically gray or dull silver in color. It is one of the refractory metals along with tantalum, tungsten, molybdenum, and rhenium, due to its very high melting point.It is estimated that niobium has a natural …
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