Edit the introduction of this paragraph.
A metallic element. Niobium can absorb gas, be used as degassing agent and be a good superconductor. It used to be called "Columbium" and it was also translated into "Columbium" (now "Columbium" is the name of the element 1 12). Chemical symbol Nb, atomic number 4 1, atomic weight 92.90638, belongs to group ⅸ B of the periodic table. 180 1 Charles Hatchett (niobium)
Hatchett) separated the oxide of a new element from the niobite collected by the British Museum in London, and named it holmium. 1802, Swedish A.G. Ekberg discovered another new element tantalum in tantalite. Because these two elements are very similar in nature, many people think they are the same element. Because it is very similar to tantalum, he was confused at first. 1844, German H. Luo Ze studied many niobite and tantalite in detail, and separated two elements to find out the truth. Finally, Charles Hachette named this element after the mythical goddess Niobe. In history, people first used the name "columbium" of niobium iron ore, and now they occasionally see this name. The content of niobium [1] in the crust is 0.002%, and the main minerals are niobite [(Fe, Mn)(Nb, Ta)2Ob] and pyrochlore [(Ca, Na)2(Nb, Ta, Ti)2O6(OH, F)], black rare gold ore, brown yttrium ore and so on. Si Nuo. : 2023-50-5[2]
Edit the element properties of this paragraph.
Niobium is an off-white metal with a melting point of 2468℃, a boiling point of 4742℃ and a density of 8.57 g/cm3. Niobium is stable in air at room temperature, and it will not be completely oxidized when burned red in oxygen. It can be directly combined with sulfur, nitrogen and carbide at high temperature, and can be alloyed with titanium, zirconium, hafnium and tungsten. It does not react with inorganic acid or alkali, but is insoluble in aqua regia and soluble in hydrofluoric acid. The oxidation states of niobium are-1, +2, +3, +4 and +5, among which the +5 valence compound is the most stable.