Solid StateMedium

Question

Platinum crystallises in a face centered cube crystal with a unit cell length of 3.9231 A0. The density and atomic radius of platinum are respectively. [Atomic mass of Pt = 195]

Options

A.45.25 g-cm-3, 2.516 A0
B.21.86 g-cm-3, 1.387 A0
C.29.46 g-cm-3, 1.48 A0
D.None of these

Solution

Density =  = 21.86 g/cm3
for fcc lattice, 4r = a√2
so,    r = = 1.387 A0

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