The coordination number for an octahedral site in pure copper is .........
Show Hint
- 4
- 6
- 8
- 12
The Correct Option is B
Solution and Explanation
In crystal structures, the coordination number refers to the number of nearest neighbors surrounding a central atom or ion. For pure copper, which adopts a face-centered cubic (FCC) crystal structure, the coordination number for an octahedral site is 6. This is because, in the FCC structure, each atom is surrounded by six atoms at an equal distance in an octahedral arrangement.
Step 1: Understanding the options
- Option (A): 4 — This is the coordination number for a tetrahedral site, not an octahedral site.
- Option (B): 6 — Correct. In the FCC structure, the coordination number for an octahedral site is 6.
- Option (C): 8 — This corresponds to the coordination number for a cubic site, which is not correct for the octahedral site in FCC copper.
- Option (D): 12 — This is the coordination number for an atom in a close-packed structure, but not for an octahedral site.
Step 2: Conclusion The correct coordination number for an octahedral site in pure copper is 6, making Option B the correct answer.
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