Sodium chloride crystallises into F.C.C lattice with Na+ occupying corner of a cube and the centre of each face, whereas Cl^(-) is occupies the centre of each edge and centre of the cube. The r_c //r_a value for NaCl is 0.53 and coordination number is 6. In NaCl unit cell, the edge length is

Sodium chloride crystallises into F.C.C lattice with Na+ occupying cor

1.	Sodium chloride crystallises into F.C.C lattice with Na+ occupying corner of a cube and the centre of each face, whereas Cl^(-) is occupies the centre of each edge and centre of the cube. The r_c //r_a value for NaCl is 0.53 and coordination number is 6. In NaCl unit cell, the edge length is
Answer» `2r_c+2r_a` `r_c +r_a` `(r_c + r_a)/(2)` `SQRT(3) (r_c +r_a)` ANSWER :A