Which noble gas has the lowest boiling point?

AHelium
BXenon
CNeon
DArgon

Answer: A

Boiling point depends on dispersion forces, which grow with atomic size and polarisability, so it rises down the group. Helium is the smallest and least polarisable, with a boiling point of about

4.2 K

. The answer is helium.

Practice p-Block Elements: Groups 17 and 18 More on Noble gases: xenon fluorides, oxides and oxyfluorides

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