In a fcc unit cell, I. atoms are present at all the corners. II. atoms are present at the centre of all the faces of the cube. III. each atom at the face centre is shared between two unit cells. Identify the correct statements.

Question

In a fcc unit cell, I. atoms are present at all the corners. II. atoms are present at the centre of all the faces of the cube. III. each atom at the face centre is shared between two unit cells. Identify the correct statements. (A) I and II (B) II and III (C) I and III (D) All of these

Tardigrade Admin · Accepted Answer

A fcc unit cell contains 8 atoms one at each corner having contribution 1 / 8 and 6 atoms one at each face having contribution 1 / 2. Hence, atoms present at each face is shared between two unit cells.

Q. In a $f cc$ unit cell,
I. atoms are present at all the corners.
II. atoms are present at the centre of all the faces of the cube.
III. each atom at the face centre is shared between two unit cells.
Identify the correct statements.

$I$ and $II$

$II$ and $III$

$I$ and $III$

All of these

A $f cc$ unit cell contains $8$ atoms one at each corner having contribution $1/8$ and $6$ atoms one at each face having contribution $1/2$ . Hence, atoms present at each face is shared between two unit cells.

Q. In a fcc unit cell, I. atoms are present at all the corners. II. atoms are present at the centre of all the faces of the cube. III. each atom at the face centre is shared between two unit cells. Identify the correct statements.

I and II

II and III

I and III