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JEE Main & Advanced AIEEE Solved Paper-2002

  • question_answer
    Number of atoms in the unit cell of Na (bcc type crystal) and Mg (fee type crystal) are respectively   AIEEE  Solved  Paper-2002

    A) 4, 4                                           

    B) 4, 2                           

    C) 2, 4                           

    D)           1, 1

    Correct Answer: C

    Solution :

    Na unit cell (body centred cubic) 8 corner atoms \[\times \frac{1}{8}=1\] atom placed inside the unit cell = 1                                    Total atoms = 2              Mg unit cell (Face centred cubic)                    8 corner atoms \[\times \frac{1}{8}=1\]                    6 face atoms \[\times \frac{1}{2}=3\]                                    Total atoms = 4


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