NEET Chemistry The Solid State Questions Solved


Silver crystallises with  face-centred cubic unit cells. Each side of the unit cell has a length of 409 pm. What is the radius of an atom of silver? (Assume that each face atom is touching the four corner atoms.)

Given : a = 409 pm     r = ?

For fcc unit cell, the formula is

r = a22

or r = 40922 = 4092×1.414 = 4092.828

 r = 144.62

 Radius of an atom of silver = 144.62 pm

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