How many lattice points are there in one unit cell of each of the following lattices ? (i)Hexagonal close packing and cubic packing ltbr

How many lattice points are there in one unit cell of each of the foll

1.	How many lattice points are there in one unit cell of each of the following lattices ? (i)Hexagonal close packing and cubic packing ltbr
Answer» Solution :LATTICE points in face centred cubic or face centred tetragonasl8 ( at corconers) + 6 ( at face centres) = 14.However, particles per UNIT cell = ` 8 xx 1/8 + 6 xx 1/2= 4` Lattice points in body centreed cube =8 ( at corners) + 1 ( at body centre) = 9 However, PATICLES , per unit cell ` = 8 xx 1/8 + 1=2`