AP EAMCET202120 Aug 2021Morning ShiftChemistrySolid StateActual
In the face centered unit cell, the lattice points are present at
Options
- Aonly the corners of the unit cell
- Bthe corners and the center of the unit cell
- Cthe corners and the face centres of the unit cell
- Donly the face centres of the unit cell
Correct answer
C. the corners and the face centres of the unit cell
Step-by-step solution
Simplest crystal is to be studied in cubic system. Three types of cubic systems are following:- ( a ) Simple Cubic   ( SC ) : Atoms are arranged at the corners of the cube. ( b ) Body Centered Cubic ( BCC ) : Atoms are arranged at the corners and at the centre of the cube. ( c ) Face Centered Cubic ( FCC ) : Atoms are arranged at the corners and at centered of the each faces. Hence, in the face centered unit cell, the lattice points are present at the corners and the face centres of the unit cell.