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What is the atomic radius of a BCC crystal structure?

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What is the atomic radius of a BCC crystal structure?

(a) a/2

(b) a/4

(c) a√2/4

(d) a√3/4

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I'd like to ask this question from Types of Solids, Crystal Structures and Lattices topic in division Solid Solutions & Crystallography of Engineering Material & Metallurgy

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Right option is (d) a√3/4

For explanation I would say: Atomic radius is defined as half the distance between the centers of two neighboring atoms. The atomic radius of a simple cube and HCP is a/2 respectively, whereas it is a√2/4 and a√3/4 for FCC and BCC respectively.

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