1.

An element crystallizes in face centred cubic lattice. Calculate the length of the side of the unit cell if the radius of atom is 200 pm.

Answer»


Solution :For face centred cubic lattice, radius, `R = a//2sqrt2` where a is the length of the SIDE of unit CELL.
Substituting the values we get :
`200 = a//(2 xx 1.4142)`
or `a=200 xx 2 xx 1.4142` = 565.7 pm


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