Dab tsi yog Chemical Element Nb?

Cov tshuaj "Nb" sawv cev rau yog: Niobium.

Niobium tshuaj cim Nb, atomic tooj 41, atomic hnyav 92.90638, belongs rau lub Periodic System V B. 1801 British C. Hatchett los ntawm columbite cais los ntawm cov oxides ntawm lub caij tshiab, thiab muab lub npe lub caij columbium (Suav txhais lus columbium). Niobium yog ib tug greyish-dawb hlau nrog ib tug melting point ntawm 2468 degree, ib tug boiling point ntawm 4742 degree, thiab ib tug ceev ntawm 8.57g / cm³.

Niobium yog ib qho xim grey hlau uas yog paramagnetic thiab belongs rau pawg 5 ntawm lub sij hawm. High purity niobium hlau yog ductile tab sis hardens nrog nce impurity cov ntsiab lus. Niobium muaj qhov qis qis qis rau cov hluav taws xob neutrons thiab yog li ntawd tseem ceeb heev hauv kev lag luam nuclear.