Question 68 of 150

What is the maximum number of layers of atoms in close packed planes that will lie within two imaginaryparallel planes having a distance between them of 1323 R (where R is the radius of atom) in the coppercrystal (FCC) ? Consider the atoms to be within the parallel planes if their centresare on or within the two parallel planes.

(1) 5

(2) 6

(3) 7

(4) 8