At low temperature and high pressure, the volume of the particles is not negligible as compared to the volume of the gas. Also, the intermolecular forces start acting upon the molecules. Hence, they deviate from ideal behavior
Since Xenon is a larger atom than Argon and has more electrons, these induce-dipole induced-dipole forces which are stronger in Xenon than in Argon.
Xenon has larger mass than helium and has larger dispersion forces. Because of larger size the outer electrons are less tightly held in the larger atoms so that instantaneous dipoles are more easily induced resulting in greater interaction between argon atoms.
Hence xenon shows the ideal noble gas deviation
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