Which statement best describes the particle arrangement in a solid?

The correct answer is Particles are closely packed and vibrate in fixed positions..

Particle lens: Describe arrangement, motion, spacing, collisions, or energy changes only when they are relevant here. This question asks: Which statement best describes the particle arrangement in a solid. The correct response is Particles are closely packed and vibrate in fixed positions., because the particle model explains the observable property using particles. In Changes of state, the marking point should connect directly to describe limitations of simple particle model diagrams for representing real particles, forces and motion. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Changes of state and the particle model, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 204 is distinct because it uses this exact question context and the particle lens rather than a generic particle-model sentence.