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(a) Calculate the number of atoms per un...

(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.

Text Solution

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(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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