Question

How many atoms can be assigned to its unit cell if an element forms (i) bcc (ii) fcc 2mark

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Answer 1

Answer:

(i) 2

Number of Atoms in BCC Cell:

Thus, in a BCC cell, we have:

8 corners × 1/8 per corner atom = 8 × 1/8 = 1 atom

1 body centre atom = 1 × 1 = 1 atom

Therefore, the total number of atoms present per unit cell = 2 atoms.

(ii) 4

Number of Atoms in BCC Cell :

Thus, in a face-centred cubic unit cell, we have:

• 8 corners × 1/8 per corner atom = 8 × 1/8 = 1 atom

• 6 face-centred atoms × 1/2 atom per unit cell = 3 atoms

Therefore, the total number of atoms in a unit cell = 4 atoms.

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Answer 2

Answer:

Explanation:

1) we have 2 atoms in bcc one is in centre and ts 8 vertex means of the cube constitutes 1/8th part so one ato. From 8 vertexes.

2)we have 4 atoms as each face constitutes 1/2 and there are 6 face so three atoms from faces and 1 atom from vertexes.