4. The unit cell of Na is bcc and its density is 0.97 g/cm'. What is the radius of a sodium atom if the molar mass oNa is 23 g/mol?(Ans:1.86x10-8 cm)5. How are non-stoichiometric point defects classified? Explain with diagram the metal deficiency defect6. Explain with one example each, the diamagnetic, paramagnetic and ferromagnetic substances.
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