The substance with the lowest known boiling point (4 K) is helium, an atomic element that has two electrons. Hydrogen isa diatomic molecule and also has two electrons, but its boiling point is significantly higher, at 20.28 K.(a) What is the dominant intermolecular force between a pair of helium atoms and a pair of H2 molecules?(b) Why do you think H2 has a higher boiling point?

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Section7.6: Noncovalent Interactions And Forces Between Molecules
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The substance with the lowest known boiling point (4 K) is helium, an atomic element that has two electrons. Hydrogen is
a diatomic molecule and also has two electrons, but its boiling point is significantly higher, at 20.28 K.
(a) What is the dominant intermolecular force between a pair of helium atoms and a pair of H2 molecules?
(b) Why do you think H2 has a higher boiling point?

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