A compound is formed by cation and anion . The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:

Question

A compound is formed by cation  and anion . The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:

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🧠 The Lattice Puzzle
Crystal formulas are determined by the ratio of atoms in a single unit cell. We need to find the "effective" number of anions and cations per cell based on their specific seating arrangements.

🗺️ The Counting Protocol
1. The Anions (A): They form an hcp lattice. 
   - A hexagonal close-packed cell contains exactly 6 effective atoms.
2. The Voids:
   - For a lattice with  atoms, there are  Octahedral Voids (OV).
   - So, .
3. The Cations (C): They occupy 75% of the octahed

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