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NEET levelSingle correct optionDifficulty 1 of 3ss113

A close packed structure with the repeating layer sequence $A B A B A B \dots$ is called

Acubic close packing (ccp)
Bbody centred cubic packing
Csimple cubic packing
Dhexagonal close packing (hcp)

Answer: D

When the third layer lies exactly above the first (sequence

A B A B

), the structure is hcp. The sequence

A BC A BC

gives ccp. Both have coordination number 12.

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