Hey guys ive got a question and im not sure how to go about answering it without looking up a table of characteristics of elements! Niobium has an atomic radius of 0.1430nm and a density of 8.57g/cm^3. Determine wheather it has an FCC or BCC crystal structure? Now i think you have to use the equation p=nA/VcNa p=density n=number of atoms associated with each unit cell A=atomic weight Vc= volume of unit cell Na= Avogadro's number but to use the equation you need to know if it is an BCC or FCC structure so you know which n value to use then inturn how to get Vc. so my question is how do i go about this type of problem?? Thanks !