The molecular property related to the ease with which the electron density in a neutral atom or molecule can be distorted is called

polarizability

Explanation:

It is called polarizability, the ease with which the electronic distribution of an atom or molecule can be distorted by the action of an external electric field.

Therefore, polarizability is the measure of the distortion capacity of the electronic cloud, within an atom or molecule, causing the formation of a momentary dipole.

An atom or a molecule can distort its electronic cloud in the presence of an ion or a dipole, causing an induced dipole