The total number of atoms in body centred cubic unit cell (bcc) is

The correct answer is Option (1) → 2

The number of atoms that belong to one unit cell is found by counting how each atom is shared. An atom at a corner is shared by 8 unit cells (1/8 each), an atom at a face centre by 2 (1/2), and an atom at the body centre belongs to one cell only.

A body centred cubic cell has 8 corner atoms and 1 body centre atom:

    \( \displaystyle 8 \times \frac{1}{8} + 1 \times 1 = 1 + 1 = 2 \)

Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.

NCERT (Pre-rationalised edition, 2022-23):
Body-Centred Cubic Unit Cell