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Simply, crystalline particles have well ordered microscopic atomic arrangement, and they are always held by intermolecular forces whereas amorphous particles do not have an ordered internal arrangement instead they have disordered or random pattern.

Oh I get it. Like maybe salt for crystalline and water for amorphous? Or do you have to tell at the atomic level?

At the atomic level, we get the right information to classify them as either crystalline or amorphous.