Identifying solids by particle lattice structures

Steps:

• Examine diagrams: X shows alternating positive/negative ions (ionic lattice), Y shows uniform positive ions in electron sea (metallic lattice), Z shows identical atoms in lattice (atomic solid).
• Recall structures: Sodium chloride (NaCl) is ionic with Na⁺ and Cl⁻ ions; potassium (K) is metallic with K⁺ ions delocalized electrons; krypton (Kr) is atomic solid of monatomic noble gas.
• Match X to NaCl (ionic), Y to K (metallic), Z to Kr (atomic).
• Select option aligning with these matches.

Why D is correct:

• D assigns X as NaCl (ionic lattice of ions), Y as potassium (metallic lattice), Z as krypton (atomic lattice), matching definitions of each solid's bonding.

Why the others are wrong:

• A misassigns X as krypton (atomic, not ionic) and Y as potassium (ignores metallic traits).
• B misassigns X as NaCl (correct) but swaps Y and Z, confusing metallic with atomic.
• C misassigns X as potassium (metallic, not ionic) and Z as krypton (correct but overall mismatch).

Final answer: D