Answer:
The correct answer is unit cell.
Explanation:
Unit cell
Smallest unit of a crystal with fixed arrangement of atoms or ions. And this geometrical arrangement of atoms is responsible for shape of crystal and symmetry possessed by the crystal. Repetition of these unit cells in a space forms crystal.
The repeating subunits that are responsible for the shape of a crystal are
known as Unit cells.
These are solids whose components are arranged in a highly ordered
microscopic structure thereby forming lattice structure.
The unit cells known as atoms in a repeated manner are responsible for
the formation and shape of the crystal.
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