Question 7

Particles are closest together in the solid state of matter.

In solids, particles are packed tightly together in a fixed arrangement, resulting in a definite shape and volume. This close proximity of particles is a defining characteristic of solids.

A) Gas

In gases, particles are far apart and move freely, resulting in no fixed shape or volume. The large distance between particles in a gas means they are not close together, making this option incorrect.

B) Liquid

While particles in liquids are closer together than in gases, they are still not as tightly packed as in solids. Liquids can flow and take the shape of their container, indicating that the particles are not in a fixed position, thus making this option incorrect.

C) Plasma

In plasma, particles are ionized and spread out with high energy, resulting in a state where particles are very far apart. This high energy and distance between particles in plasma make this option incorrect.

D) Solid

In solids, particles are closely packed in a fixed structure, allowing them to vibrate in place but not move freely. This arrangement is what defines a solid and makes this the correct answer.

Conclusion

The solid state of matter is characterized by particles that are closely packed together in a fixed arrangement, which is not the case for gases, liquids, or plasmas. The unique properties of solids stem from this tight packing, confirming that option D is the only correct answer. All other options represent states of matter where particles are significantly spaced apart.