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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 !