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(a) Isomorphism: Two or more substances having the same crystal structure (and similar chemical formula / atomic ratio) are said to be isomorphous, and the phenomenon is called isomorphism. Example: NaF and MgO; K2SO4 and K2SeO4.

(b) Unit cell: A unit cell is the smallest repeating structural unit of a crystalline solid which, when repeated in different directions in three dimensions, generates the entire crystal lattice. It is described by its edge lengths a, b, c and the angles α, β, γ between them.

Doubtly AI · 27 Oct 2026 AI-verified · Oct 2026 Report
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