The ease of liq\uefaction of noble gases increase in the order (a) Ar>Kr>Xe>Ne>He (b) Xe>Kr>Ne>A

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The ease of liq\uefaction of noble gases increase in the...

The ease of liquefaction of noble gases increase in the order (a) $\mathrm{Ar}>\mathrm{Kr}>\mathrm{Xe}>\mathrm{Ne}>\mathrm{He}$ (b) $\mathrm{Xe}>\mathrm{Kr}>\mathrm{Ne}>\mathrm{Ar}>\mathrm{He}$ (c) $\mathrm{Kr}>\mathrm{Xe}>\mathrm{He}>\mathrm{Ne}>\mathrm{Ar}$ (d) $\mathrm{He}>\mathrm{Ne}>\mathrm{Ar}>\mathrm{Kr}>\mathrm{Xe}$

The ease of liquefaction of noble gases increase in the order
(a) $\mathrm{Ar}>\mathrm{Kr}>\mathrm{Xe}>\mathrm{Ne}>\mathrm{He}$
(b) $\mathrm{Xe}>\mathrm{Kr}>\mathrm{Ne}>\mathrm{Ar}>\mathrm{He}$
(c) $\mathrm{Kr}>\mathrm{Xe}>\mathrm{He}>\mathrm{Ne}>\mathrm{Ar}$
(d) $\mathrm{He}>\mathrm{Ne}>\mathrm{Ar}>\mathrm{Kr}>\mathrm{Xe}$

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Key Concepts

Noble Gases

Noble gases are elements that are characterized by their complete electron shells, which makes them chemically inert and leads them to interact only through weak intermolecular forces. Their lack of strong bonding interactions is a key reason why very low temperatures are needed to condense them into liquids.

Intermolecular Forces

The primary intermolecular forces in noble gases are London dispersion forces, which are weak attractions arising from temporary fluctuations in electron density. The strength of these forces increases with the number of electrons, making heavier noble gases more susceptible to liquefaction.

Boiling Point

The boiling point of a substance is the temperature at which it changes from a liquid to a gas. For noble gases, higher boiling points indicate that the gas is more easily condensed into a liquid, as stronger dispersion forces require higher temperatures to overcome.

Atomic Mass and Dispersion Forces

As the atomic mass of noble gases increases, so does the number of electrons and the overall polarizability of the atoms. This leads to stronger dispersion forces and consequently higher boiling points, meaning heavier noble gases like xenon are more easily liquefied compared to lighter ones like helium.

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