Which noble gas has the lowest boiling point?

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(A) The boiling point of noble gases increases down the group due to the increase in the magnitude of van der Waals forces as the atomic size increase

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Helium

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(A) The boiling point of noble gases increases down the group due to the increase in the magnitude of van der Waals forces as the atomic size increases.Helium $(He)$ is the first element in Group $18$ and has the smallest atomic size.Due to its extremely weak interatomic van der Waals forces,Helium has the lowest boiling point of all known substances,which is approximately $4.2 \ K$.

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