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(1) Both Statement I and Statement II are correct.
(2) Both Statement I and Statement II are incorrect.
(3) Statement I is correct and Statement II is incorrect.
(4) Statement \( \mathrm{I} \) is incorrect and Statement II is correct.
Statement-I: If a is the unit cell length of a cubic lattice, the atomic radius is \( \frac{\mathrm{a}}{2} \) for a simple cubic cell, \( \frac{\sqrt{3} \mathrm{a}}{4} \) for a body Centred cubic cell, and \( \frac{\sqrt{2} \mathrm{a}}{4} \) for a face Centred cell.
Statement-II: From a knowledge of the dimensions of the unit cell and Avogadros number, we can calculate the crystal density.
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