Which best describes the motion of helium atoms in gaseous helium

Random motion in all directions.

Explanation:

It must be understood that the movement of atoms in a molecule is strictly based on the kinetic energy possessed by these particles.

Now, the gaseous state gives the highest level of freedom to these particles and thus they possess their highest kinetic energy in this state.

In gaseous helium, the atoms are expected to have a very high kinetic energy and thus they move in a haphazard or in an irregular manner.

This is principally due to the fact that in the gaseous state, atoms are most less confined and thus they are not restricted to a certain space.

This is in sharp contrast to the movement of atoms in the solid and liquid state. While atoms are mostly confined in the solid state such that they only merely vibrate about a fixed point, their movement in the liquid state is less restricted and they exhibit more freedom. This however is far less than the amount of freedom the gaseous state would avail its own particles.

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just finished the assignment

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.