(a) What is a unit cell? (b) Name the three types of centred unit cells.

Question

Unit cells can be broadly classified into 2 categories primitive and centred unit cells.

(a) What is a unit cell?

(b) Name the three types of centred unit cells.

(c) The unit cell dimension of a particular crystal system is a = b = c, α = β = γ = 90°. ldentify the crystal system.

(d) Give one example for the above crystal system.

Answer 1

(a) The smallest repeating unit of a crystal.

(b) Body centred unit cell, Face centred unit cell and End centred unit cell.

(c) Cubic crystal system.

(d) NaCI (Rock salt struãture)