Metallic Bonding in Solid Metals Steps:

• Identify solid metal structure as a giant lattice of positive ions in a regular arrangement.
• Recognize delocalized valence electrons forming a "sea" that binds the ions.
• Eliminate diagrams showing discrete bonds or molecules, as metals lack them.
• Select the diagram illustrating packed ions with surrounding electron cloud.

Why B is correct:

• It shows a lattice of positive ions immersed in delocalized electrons, matching the metallic bonding model where electrons are free to move.

Why the others are wrong:

• A: Depicts discrete molecular structures, typical of covalent compounds, not metals.
• C: Illustrates alternating positive and negative ions, characteristic of ionic solids like salts.
• D: Shows loosely packed atoms without electron delocalization, resembling a gas or simple molecular solid.

Final answer: B