Which of the following best describes the arrangement of particles in a solid?

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

Application lens: Apply the rule to the specific sample or situation instead of reciting a broad fact. This question asks: Which of the following best describes the arrangement of particles in a solid. The correct response is Particles are closely packed and vibrate in place, because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to explain freezing using decreased particle energy and changed particle arrangement. 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 127 is distinct because it uses this exact question context and the application lens rather than a generic particle-model sentence.