An engineering drawing claims to depict an "all-metallic laminate" used for electrical contacts. The textual description of one repeating unit within the laminate is as follows:
Layer A: Closely packed planes of identical metallic atoms labelled Ag, with delocalized electrons shown between atoms.
Layer B: A planar array of F− ions alternating with Mg2+ ions in a checkerboard pattern.
Layer C: A substitutional alloy layer in which 20 % of the lattice sites of a Cu matrix are replaced by Ni atoms.
Layers A, B, and C are stacked in the order A–B–C–A–B–C, etc.
Assume the drawing is intended to represent a single crystalline material, not a composite glued together.
Respond to the following prompts.
(a) Identify which layer(s), if any, cannot be classified as metallic or alloy bonding based on the structural description. Provide a detailed justification rooted in the nature of chemical bonding and lattice structure.
(b) Propose one experimental test that could be performed on the actual laminate to determine whether Layer B behaves electrically as a metallic, ionic, or covalent solid. Outline the expected observations for each possible bonding type.
(c) Assuming Layer B were replaced by an interstitial bronze (Sn atoms in Cu), predict qualitatively how this substitution would affect the overall malleability of the laminate and explain your reasoning in terms of lattice distortions and slip systems.
(d) Draft a revised, text-based schematic for the repeating unit that removes any bonding inconsistencies while keeping three distinct metallic or alloyed layers. Your description should clearly state the type of alloying (if any) in each layer and the relative arrangement of atoms.