IGNOU BCHCT 137 2026 - Explain the seven primitive unit cells in crystals. Give suitable diag

Question

Explain the seven primitive unit cells in crystals. Give suitable diagrams.

10 Jan 2026

Answer :

Word Count : 305

In crystallography, a primitive unit cell is the smallest repeating unit that, by pure translation, can generate the entire crystal lattice. There are seven primitive unit cells corresponding to the seven crystal systems. The cubic primitive unit cell has all edges equal, a = b = c, and all interaxial angles α = β = γ = 90°. Its lattice points are located only at the eight corners of the cube. ``` •────• │ │ │ │ •────• ```

_______ _____ _____ ______ _____ __________ __________ _________ _________.
_____ _________ ____ __________ ___ ______ __________ _________ ___ _____.
__________ ______ _________ ____ _____.
_________ ______ _______ ________ ____ _____ _________ ___ __________ _____ _____ ______.
________ ___ ______ _______ __________.
______ ___ __________ ____ ______ ___ _______ _________ ____.
______ _______ _________ _________ __________ ________ ______ ________ __________ _______.
__________ __________ _____ _________ ___ __________ ________ __________.
__________ ________ _________ ____ __________.
______ ____ ________ _________ ______ _________ ____.
______ ________ ____ _____ ________ _________ ________ __________ ________.
________ _____ ___ ________ __________ ____ ______ ____ ______ ____ ___ ___.
________ _______ _____ ________ ________.
_____ ___ _______ __________ _________ ______ ______ ___ ________ ______ ____ ____.
_________ __________ ___ ________ _____ ____ _______ _______ _____ ________ ________ _________.
_____ _________ _____ ________ ______ ________ ____ ____ _________.
__________ __________ ______ _______ _____ _________ _____ ___ ____ _______ _______ _________.
________ ____ ____ _____ __________ ________ ___ _____ ________.
______ ______ ____ __________ ____ _____ _________.
_________ ___ ______ ____ _________ ___.
___ ____ ___ _______ __________ ______ ____.
_____ _________ ________ ______ __________ _________ ______ ______ _________ __________ _____ ___.
__________ _______ ______ ________ __________ __________ ________ _________ _________ _________ _________ ____.
____ _________ _______ ____ _____ _______ __________ ______ ___ _____.
_________ ___ ________ __________ ________ _______ ____ ________ ____ ____.
___ _____.

IGNOU ACADEMY

Your IGNOU journey, made easier.

Solved Assignments
Study Notes
Guess Papers
Question Papers

Call Us WhatsApp

STUDY • PREPARE • SUCCEED

Skip in 10

IGNOU Solved Assignments Assignments Ignou Projects Project Previous Year Solved Exam Papers Notes Notes Sample Question Papers Sample Question Papers