Q. The number of atoms per unit cell in a body-centered cubic (BCC) structure is:

शरीर-केंद्रित घन (बीसीसी) संरचना में प्रति इकाई कोशिका परमाणुओं की संख्या है:

BCC has atoms at all 8 corners and 1 atom at the center.
Each corner atom is shared by 8 unit cells, so contribution per unit cell is $8 \times \frac{1}{8} = 1$ .
The center atom belongs entirely to the unit cell, so contribution is 1.
Total atoms per unit cell = 1 (corners) + 1 (center) = 2.

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