What is the strongest interparticle force in a sample of kr?

London Dispersion Force is the strongest interparticle force in a sample of Kr.

Explanation:

Krypton belongs to Noble Gases. They exists in monoatomic form as they are inert in nature and are very less reactive. So, as there is no polarity in Krypton so it will fail to create either Dipole-Dipole or Hydrogen Bond Interactions between its atoms. While, London Dispersion Forces or Van Der Waals forces can exist between Kr atoms. When Kr atoms approaches one other they create Instantaneous dipole. This Instantaneous dipoleinduces dipole in second Kr atom and the process starts propagating. Hence, interactions are generated between Kr atoms.