The radius of calcium ion is 94 pm and of oxide ion is 146pm. Predict the crystal structure of calcium oxide.

Explanation

To predict the crystal structure of calcium oxide (CaO) based on the given ionic radii, we can follow these steps:

### Step 1: Identify the Ionic Radii
- The radius of the calcium ion (Ca²⁺) is given as 94 pm.
- The radius of the oxide ion (O²⁻) is given as 146 pm.

### Step 2: Calculate the Radius Ratio
- The radius ratio is calculated using the formula:
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