Which statement best describes the atoms in a solid?

• A. Atoms are closely packed together and vibrate in fixed positions.
• B. Atoms are ionized and exist as a plasma.
• C. Atoms are loosely arranged and slide past one another.
• D. Atoms are far apart and move freely in all directions.

Answer: (A)

Verified step by step guidance

1. Understand the states of matter and how atoms behave in each: solid, liquid, gas, and plasma.
2. Recall that in a solid, atoms are tightly packed in a fixed, orderly arrangement, which restricts their movement to vibrations around fixed points.
3. Compare this to liquids, where atoms or molecules are close but can slide past each other, and gases, where atoms are far apart and move freely.
4. Recognize that plasma consists of ionized atoms or molecules, which is a different state of matter from solids.
5. Conclude that the best description for atoms in a solid is that they are closely packed together and vibrate in fixed positions.