Na and Mg crystallize in BCC and FCC type crystal respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is:
Number of crystal systems having, only 2 types of Bravais lattices = x, Number of crystal systems having, at least 2 interfacial angles equal = y, All the three interfacial angles and all the three axes lengths equal = z Then find y -(x +z) .
Na and Mg crystallize in bcc- and fcc-type crystals, respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is