AP EAPCET 07-Jul-2022 Shift 1 Paper

A atoms are present at body Centre.
∴ Number of atoms =1
Contribution of body Centre =1
∴ Effective number of atoms A=1×1=1
B atoms are present at corners.
∴ Number of atoms at corners =8
Contribution of corner =

1

8

∴ Effective number of B=8×

1

8

=1
C atoms are present at half of face center's.
∴ Number of atoms =

6

2

=3
∴ Contribution of face center =

1

2

∴ Effective number of C=3×

1

2

=

3

2

.
Hence, formula of the lattice as : A1B1C

3

2

or A2B2C3