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Close packing, voids and radius ratio
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ss074
Which stacking sequence of close-packed layers corresponds to cubic close packing (ccp)?
A
ABABAB...
B
AABBAA...
C
ABCABC...
D
ABBABB...
Answer: C
In ccp the third layer covers the octahedral voids of the second, so it differs from both A and B. The pattern is ABCABC..., whereas hcp is ABAB....
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