NEET Chemistry The Solid State Questions Solved

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Aluminium crystallizes in an fcc structure. Atomic radius of the metal is 125pm. What is the length of the side of the unit cell of the metal?

For fcc, Formula : r = a22

Given: r= 125 pm

 a = 22 r 

    a = 22  × 125

a = 2×1.414×125 = 353.5 pm

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