The maximum possible coordination number of an atom in hcp structure of an element is 12.
2Na+ will replaced by Mg2+ ion to maintain electrical neutrality thus ahole created for lattice site for every Mg2+ ion introduce thus the defect produced will schottky defect
Body centre wholly belongs to the unit cell in which it is present. Thus
in a body-centered cubic (bcc) unit cell:
(i) 8 corners × 1/8per corner atom= 8 x 1/8 = 1 atom
(ii) 1 body centre atom = 1 × 1 = 1 atom
∴ Total number of atoms per unit cell = 2 atoms
For face centred
(i) 8 corners atoms × 1/8 atom per unit cell
= 8 x1/8 = 1 atom
(ii) 6 face-centred atoms ×1/2 atom per unit cell = 6 ×1/2 = 3 atoms
∴ Total number of atoms per unit cell = 4 atoms
arsenic (As) or phosphorus (P).