PRIMITIVE AND CENTRED UNIT CELLS

Match the type of unit cell given in Column I with the features given in Column II. coloumn I (i) primitive cubic unit cell (ii) Body centred cubic unit cell (iii) Face centred cubic unit cell (iV) End centred orthohomic unit cell Column -II (a) Each of the three perpendicular edges compulsorily have the different edge length i.e., anebbec (b) Number of atoms per unit cell is one (c) Each of the three perpendicular edges compulsorily have the same edge length i.e., a=b=c (d) In additions to the contribution from the corner atoms the number of atoms present in a unit cell is three.

In a unit cell, atoms A, B, C and D are present at comers, face centres, body - centre and edge - centre respectively in a cubic unit cell. The total number of atoms present per unit cell is

Coodination number in unit cell of Simple Cubic| Body Centred Cubic and Face Centred Cubic | Problems related to Density | Characteristics of HCP unit Cell

In a unit cell, atoms A, B, C and D are present at half of total corners, all face - centres, body - centre and one third of all edge - centres respectively. Then formula of unit cell is

Assertion:Face centred cubic cell has 4 atoms per unit cell. Reason:In fcc unit cell , there are 8 atoms at the corners and 6 atoms at face centres .