WHAT IS PRIMITIVE AND CENTRED UNIT CELLS ?

Gold (r = 0.144nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

A metal has face-centred cubic unit cell. The radius of an atom of the metal is 1.28Å. What is the edge length of the unit cell?

Crystalline solid AB has face-centred cubic unit cell. Corners and the face centres of unit cell are occupied by atoms A. The edge centres and body centre of the unit cell are occupied by atoms B. If all the face-centred atoms along one of the axes are removed, then resulting chemical formula of the solid will become-

Sodium crystallises in a body-centred cubic unit cell. (bcc) with edge length 4.29Å . What is the radius of the sodium atom ? What is the length of the body-diagonal of the unit cell?

Assertion(A) : Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four. Reason ( R) : Besides the body centre there is one octahedral void present at the centre of each of the six faces of the unit cell and each of which is shared between two adjacent unit cells.

In the fcc arrangement of A and B atoms whose A atoms are at corners of the unit cell and B are at the face centres one of the A atom is missing from one corner in each unit cell. What is the simplest formula of the compound?

A crystalline compound formed by elements A and B has facecentred cubic unit cell. The corners and the face-centred of the unit cell are occupied by A and B atoms, respectively. If one of the corner-atoms is found to be missing, then what would the formula of the compound be?

A unit cell consists of a cube in which there are A atoms at the corners and B atoms at the face centres. Two A atoms are missing from the two corners of the unit cell. What is the formula of the compound ?

Determine the number of formula units of NaCl in one unit cell. NaCl is face centred cubic.

What is unit cell of a crystal lattice? What parameters are used to characterise a unit cell?