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Nickel (fcc) has the lattice parameter of 3.52 A^{° .}calculate the atomic planar density ( number of atoms per unit area) on (100),(110), and (111) planes. Is it possible to pack the atoms more closely than in (111) plane?

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7. Nickel (fcc) has the lattice parameter of 3.52 Å. Calculate the atomic planar density (number of atoms per unit area) on (100), (110) and (111) planes. Is it possible to pack the atoms more closely than in (111) plane? (1.61×10¹⁹, 1.14x10¹⁹, 1.86x10¹⁹ atoms m-²; No)
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