Question

Niobium has an atomic radius of 0.1430 nm and a density of 8.57 g/cm3. Determine whether it has an FCC or BCC crystal structure.

Answer 1

Is this the exact question ? I think The radius of Nb is not ri8 it should be edge length . If it is the we can use the formula

● d = Z × M / N × a^3

●Where
d = density
M = molar mass
N = Avogadro Number
a = Edge length of the cube
Z= Number Of Atoms in a unit cell
Now Find out Z from here

If Z = 4 then FCC
Z= 2 Then BCC