question_answer

  Explain how you can determine the atomic mass of an unknown metal if you know its mass density and the dimensions and type of the unit cell of its crystal?                                                                                                    [2]

Answer:

  Density of the unit cell (d) where Z is the number of atoms in the unit cell. Z =1 for simple cubic Z = 2 for bcc structure Z = 4 for fee structure M = atomic mass of the metal a = edge length  = Avogadro's number Thus, atomic mass                                                      [1]