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In an fcc unit cell, atoms are numbered ...

In an fcc unit cell, atoms are numbered as shown below

The atoms not touching each other are (Atom numbered `3` is face center of front face)

A

3 and 4

B

1 and 3

C

1 and 2

D

2 and 4

Text Solution

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3 and 4 are touching each other where centre to centre distance `(a)/(sqrt2)` 1 and 2 are not touching each other.
1 and 3 touching each other where centre to centre distance `(a)/(sqrt(2))`
2 and 4 touching each other where centre to centre distance `(a)/(sqrt(2))`
Note: Every face centre atom touches every other face centre atom provided it is not the opposite face centre atom in a FCC unit cell.
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