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EAMCET Medical EAMCET Medical Solved Paper-2006

  • question_answer
    Sodium metal crystallises at room temperature in a body centred cubic lattice with a cell edge \[\alpha =4.29\overset{\text{o}}{\mathop{\text{A}}}\,.\]The radius of sodium atom is:  

    A)  1.40                                      

    B)  2.65

    C)  1.85                                      

    D)  2.15

    Correct Answer: C

    Solution :

                     For a body centered cubic lattice radius (r) \[=\frac{\sqrt{3}}{4}a=0.433\,a\] Therefore, radius of \[\text{N}{{\text{a}}^{\text{+}}}\] \[=0.433\times 4.29=1.8575\]


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