Crystalline substance have a definite arrangement of atoms, ions or molecules in a regular repeating pattern. The following are crystalline substances:
The common thread that holds all crystals together is the presence of a regular repeating unit. This regular repeating unit may be atoms, molecules or ions.
Crystals are usually highly ordered owing to inter-molecular or ionic interactions which help the constituents of the crystal to maintain a definite shape and form.
All the substance listed above have regular repeating units hence they can rightly be classified as crystals.
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