Solids have fixed, ordered particle structures

Steps:

• Recall that solids maintain a definite shape and volume due to particle behavior.
• Identify particle arrangement: In solids, particles are packed in a regular, lattice-like pattern.
• Identify forces: Strong intermolecular forces hold particles in fixed positions, preventing free movement.
• Match to options: Regular arrangement with strong forces corresponds to choice A.

Why A is correct:

• In solids, particles vibrate in fixed positions within a regular lattice, bound by strong electrostatic forces as defined in kinetic molecular theory.

Why the others are wrong:

• B: Irregular arrangement describes liquids or gases, not solids; weak forces fit gases.
• C: Regular arrangement is correct for solids, but weak forces apply to liquids.
• D: Irregular arrangement fits amorphous materials or liquids, but solids typically have strong forces.

Final answer: A