Question

Which one has the highest boiling point?

• A. He
• B. Ne
• C. Kr
• D. Xe

Answer 1

Answer: (D)

As we move down the group of noble gases, molecular mass increases by which dipole produced for a moment and hence London forces increases from $He$ to $Xe$.
Therefore, more amount of energy is required to break these forces, thus boiling point also increases from $He$ and $Xe$.