Which of the following best describes the particle arrangement in a solid (Changes of state)

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

Particle lens: Describe arrangement, motion, spacing, collisions, or energy changes only when they are relevant here. This question asks: Which of the following best describes the particle arrangement in a solid (Changes of state). The correct response is Particles are closely packed and vibrate in place, because gas pressure comes from particle collisions with container walls. In Changes of state, the marking point should connect directly to explain sublimation as a change directly between solid and gas. 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 156 is distinct because it uses this exact question context and the particle lens rather than a generic particle-model sentence.