Question
The density of chromium is 7.2 g cm–3. If the unit cell is cubic with edge length of 289 pm, determine the type of the unit cell (Atomic mass of Cr = 52 amu).
Solution
Solution:
We have given that
Gram atomic mass of Cr(M) = 52.0 g mol-1
Edge length of unit cell (a) = 289 pm
Density of unit cell = 7.2 g cm-3
Avogadro's Number
or
Since the unit cell has 2 atoms, it is body centre in nature.