A **body-centred cubic (bcc)** unit cell has effective number of particles:
A1
B2
C4
D8
Answer & Solution
Correct answer: B. 2
8 corners × 1/8 + 1 body centre × 1 = 1 + 1 = **2** particles per bcc unit cell. Examples: Na, K, Cs, Cr, α-Fe.
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