A solid has a bcc structure. If the distance of closest approach between the two atoms is \( 1.7...

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A solid has a bcc structure. If the distance of closest approach between the two atoms is \( 1.73 \AA \). The edge length of the cell is
(1) \( 200 \mathrm{pm} \)
(2) \( \sqrt{3} / \sqrt{2} \mathrm{pm} \)
(3) \( 142.2 \mathrm{pm} \)
(4) \( \sqrt{2} \mathrm{pm} \)
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