12th Class Chemistry Sample Paper Chemistry Sample Test Paper-7

  • question_answer
      Sodium crystallizes in the cubic lattice and the edge of the unit cell is 430 pm. Calculate the number of atoms in a unit cell. What is the structure of sodium crystal? (Density of , atomic mass of )                                                2

    Answer:

                      Density of a crystal =                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         The number of atoms in a unit cell is two thus sodium crystal has bcc structure.                                                 


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