Atomic arrangement classification: material with order in some directions only Identify the correct term for a material whose atoms are regularly arranged in some directions but not in others (partially ordered structure). Choose the correct classification.

Difficulty: Medium

Correct Answer: Mesomorphous material (e.g., liquid crystalline)

Explanation:

Concept

Crystalline: long-range periodic order in three dimensions.
Amorphous: no long-range order.
Mesomorphous (mesophase): partial/anisotropic order (e.g., liquid crystals) — ordered in some directions, disordered in others.

Reasoning
The description matches a mesomorphic state (partial long-range orientation), not fully crystalline or fully amorphous.

Final Answer
Mesomorphous material (e.g., liquid crystalline)

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