1.

(a) Calculate the number of atoms per unit cell of fcc. (b) What is ferromagnetism ? Give an example for ferromagnetic substance. (c) Give an example for molecular solid.

Answer»

Solution :(a) 8 corner atoms `xx (1)/(8)` ATOM + 6 face centered atoms `xx (1)/(2)` atom = 4.
(B) SUBSTANCES which are strongly attracted by magnetic field. Iron or Cobalt or Nickel or `CrO_(2)` or any other.
(c) `I_(2)` or any SUITABLE example.


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