Problem: In the crystal structure of potassium oxide, the oxide ions are coordinated by eight potassium ions.What is the coordination number of potassium?

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We’re being asked to determine the coordination number of potassium in the crystal structure of potassium oxide


Coordination number (C.N.) refers to the number of ligand atoms bonded to the central metal cation. In determining the coordination number of potassium in the crystal structure of potassium oxide, we need to know first its crystal structure.


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In the crystal structure of potassium oxide, the oxide ions are coordinated by eight potassium ions.

What is the coordination number of potassium?