Question

Which one has the highest boiling point?

Options

• He

• Ne

• Kr

• Xe

Answer 1

Xe

Explanation:

Among the noble gases He, Ne, Kr, and Xe, the boiling point increases down the group because the atomic size and van der Waals forces become stronger. Xenon has the largest atomic size and strongest intermolecular forces, so it has the highest boiling point. Helium has the lowest boiling point due to very weak forces and small size.