The close packing ABCABC... represents a CCP lattice. This can also be visualised as the Face centred cubic lattice or the FCC lattice. The number of atoms present in Unit cell of CCP lattice is
2
4
6
8
As we learnt,
CCP lattice can also be visualised as the FCC lattice. Hence, the number of atoms present in the unit cell of the FCC lattice is 4.
Therefore, the correct answer is Option (2).
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