G Narayana Raju
Last Activity: 13 Years ago
the total no of atoms in hcp is 6.
the volume of the unit cell=6x(1.723/4)(2r)2x4r(1.414/1.723).
volume covered by the 6 atoms =6(4/3)xpixr3.
packing fraction=(volume covered by the atoms)/(volume of the unit cell)
=0.74(approx).