10. A metal Z with atomic radius r forms a cubic close-packed structure. Which formula correctly calculates the radius of the largest sphere that can fit in an octahedral hole without pushing any atom Z apart?
(A) r(√2-1)
(B) r(2√2-1)
(C) r(√3-1)
(D) r(3/√3-1)
(E) r/(2√2-1)

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