Which of the following is correct for a two-d | vedclass

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(D) In $2D$ square packing,the coordination number is $4$ and the packing fraction is $\frac{\pi}{4} \approx 0.785$. In $2D$ hexagonal packing,the coo

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In hexagonal close packing,each atom is surrounded by six trigonal planar voids.

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(D) In $2D$ square packing,the coordination number is $4$ and the packing fraction is $\frac{\pi}{4} \approx 0.785$. In $2D$ hexagonal packing,the coordination number is $6$ and the packing fraction is $\frac{\pi}{2\sqrt{3}} \approx 0.906$. Since the packing fraction of hexagonal packing $(0.906)$ is higher than square packing $(0.785)$,the void fraction $(1 - 	ext{packing fraction})$ of hexagonal packing is lower than that of square packing. In $2D$ hexagonal close packing,each atom is in contact with $6$ other atoms,creating $6$ trigonal planar voids around it.

Which of the following is correct for a two-dimensional closed-packed crystal?

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