Past exam of the chemistry A course of the University of Cambridge / 2025 / Paper 2 / A9 / a

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- Solution a

Solution

In a body-centred cubic lattice, touching atoms lie along a body diagonal. Its length is

3 a

and spans four radii, so

r = \frac{3 a}{4} = 1.37049 \overset{˚}{A} = 137.05 pm .

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