Which noble gas is expected to show the largest deviations from the ideal gas behavior?

Radon or Oganesson

Explanation:

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Considering that the higher both the critical temperature and pressure the higher both the attractive and repulsive intermolecular forces, there will be a larger deviation from ideality for the elements nearer to the 6th or 7th period in group VIIIA (noble gases). Furthermore, their atomic radius is bigger, which increases the probabilities of molecular collisions, circumstance that is neglected in the ideal gas law.

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it is the most commonly accepted one

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