A long-range order in the close packing of particles is observed in ________ solids.

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Solution

In crystalline solids, particles have a regular arrangement pattern.
They have a repeating unit.
Their physical properties are different in different directions.
They are also known as true solids.
Examples: diamond, table salt, metals
Therefore we could say that long-range order in the close packing of particles is observed in crystalline solids.

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