$$When a $F$orce is applied to a metal, what happens to the metal $c_{\mathrm{ations}}$ within the structure?

• A. The metal $c_{\mathrm{ations}}$ are expelled from the metal lattice.
• B. The metal $c_{\mathrm{ations}}$ are converted into $a_{\mathrm{nions}}$.
• C. The metal $c_{\mathrm{ations}}$ shift from their equilibrium positions, allowing the layers to slide past each other.
• D. The metal $c_{\mathrm{ations}}$ gain $e-$lectrons and become neutral atoms.

Answer: (C)

Verified step by step guidance

1. Understand that metals have a crystalline lattice structure composed of positively charged metal cations arranged in a regular pattern, with free electrons moving throughout the lattice.
2. When a force is applied to a metal, it causes a mechanical stress that distorts the metal's lattice structure, affecting the positions of the metal cations.
3. The metal cations do not leave the lattice or change their charge; instead, they shift slightly from their original equilibrium positions within the lattice.
4. This shift allows the layers of metal atoms to slide past each other, which is the fundamental mechanism behind the metal's ability to deform (plastic deformation) without breaking immediately.
5. Therefore, the key effect of applying a force is the displacement of metal cations within the lattice, enabling the metal to change shape while maintaining its overall structure.