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The unit cell for Al2O3 has hexagonal symmetry with lattice parameters a=0.4759nm and c=1.2989nm. If the density of this material is 3.99g/cm3, calculate its atomic

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The unit cell for Al2O3 has hexagonal symmetry with lattice parameters a=0.4759nm and c=1.2989nm. If the density of this material is 3.99g/cm3, calculate its atomic packing factor. The atomic weights of Al and O are 26.98g/mol and 16.00g/mol, respectively. Furthermore, the ionic radii for the Al3+ and O2, ions are 0.053nm and 0.140nm, respectively

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