What is the arrangement of particles in a gas?

A perfect example of "Brownian motion" is the motion of molecules in a gas; this is a totally random movement of particles that exert very little (read "none" in the kinetic-molecular theory of gases) force on one another.

This indicates that they travel in straight lines apart and change course completely at random when they collide.

Thus, if you define arrangement as any kind of regular structure or pattern, then gas molecules exhibit absolutely no arrangement.

In a gas, particles are typically arranged in a random and disordered manner. They move freely and rapidly in all directions, colliding with each other and with the walls of the container they are in. The distance between gas particles is much greater than the size of the particles themselves.

In a gas, particles are arranged in a random and chaotic manner. They move freely in all directions, constantly colliding with each other and the walls of the container in which they are confined. Gas particles have high kinetic energy, allowing them to move rapidly and independently of each other. There is significant space between gas particles, and they are not held together by strong intermolecular forces like solids or liquids. Instead, gas particles interact through occasional collisions, which are elastic and do not result in any permanent change in the particles' properties. Overall, the arrangement of particles in a gas is highly dynamic and characterized by constant motion and randomness.