Solid calcium occurs as either cubic closest packing or hexagonal closest packing. What is the most significant difference between these two structures?

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The coordination number of the calcium atoms in a single layer

The distance between calcium atoms in adjacent layers

The distance between calcium atoms in a single layer

The placement of layers of calcium atoms

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Detailed Solution

[Tetrahedral voids of and layer is covered by spheres of 3rd layer

ABAB $\to$ pattern; hcp
when octahedral vords are covered ABCABC pattern :- CCP
document of layers of calcium atom

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