JEE Main Chemistry question

Not in JEE Main or NEET syllabus

In a face-centred cubic cell, an atom at the face centre is shared by:

(A)4 unit cells
(B)2 unit cellsCorrect
(C)1 unit cell
(D)6 unit cells

Answer: (B)

Solution

A face of a unit cell is common to exactly two adjacent unit cells (the cell on each side of that face), so any atom sitting at a face centre is shared between 2 unit cells,

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Question ID VK-141709