Material DescriptionN朋坐iobium is a grey-white metal 年問with melting point of 2468℃, boiling 了多point of 4,742 ℃, an嗎為d density of 8.57g/cm3. Niobium 學妹is stable in air at 制通room temperature, and cannot be f見理ully oxidized in oxygen even when i西通t’s hot and turns red; it ca