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NEET AIPMT SOLVED PAPER SCREENING 2012

  • question_answer
    A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is

    A) 288 pm                

    B) 408 pm

    C)        144 pm         

    D)        204 pm

    Correct Answer: A

    Solution :

    For fee lattice, \[4r=\sqrt{2}a\] \[r=\frac{\sqrt{2}}{4}a=\frac{a}{2\sqrt{2}}\] \[=\frac{408}{2\sqrt{2}}\] \[=144\,pm\]     diameter d = 2r = 2 x 144 pm = 288pm


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