Relation of the size of atoms with the strength of attractions

[Kyle Harvey 4F]

How does an increasing size of an atom or molar mass relate to stronger attractive interactions? Is it due to the increased number of electrons and protons, so there is an increase in intermolecular forces?

[ckilkeary 2G]

How I think it works are larger atoms and molecules have stronger attractive interactions because valence electrons are farther from the nuclei so they are less tightly held to the nucleus and can form dipoles with more ease.

[Vuong_2F]

The larger the molecule, the larger the electron clouds will be, which allows for a stronger temporary dipole and greater London dispersion forces.