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Which of the following are the types of materials, that are categorized based on its atomic arrangement?

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Which of the following are the types of materials, that are categorized based on its atomic arrangement?

(a) Crystalline

(b) Amorphous

(c) Semi-crystalline

(d) Crystalline, amorphous and semi-crystalline

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This interesting question is from Principles topic in portion Corrosion Principles of Corrosion Engineering

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Correct option is (d) Crystalline, amorphous and semi-crystalline

Easiest explanation: The atoms in the crystalline materials are regularly arranged with the same repeating unit in a long-range order. Examples of crystalline materials are metals.

The atoms in which the atoms are not regularly arranged over a long-range are called amorphous materials. Example: Glass, rubbers.

Whereas semi-crystalline is the combination of both crystalline and amorphous materials.

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