11) The boiling points of noble gases are given as... (2023)

The boiling points of noble gases increase with increasing atomic mass. Due to increased van der Waals force. Increasing the size increases the van der Waal forces, which increases the boiling point.

(a) The order of intermolecular forces is Xe > Kr > Ar > Ne because strongerintermolecular force, the bigger theboiling point ofthe substance becomes. That's because strongerintermolecular bondsI need more energyForto break. Since this energy is provided in the formvonheat whenBoil, substancescombut strongLinkwill have a tallerBoiling point.

(b) The order of increasing atomic radius is Xe > Kr > Ar > Ne because the group size increases downwards. AsVan der Waals forces, or weak London dispersion forces, exist between atoms of noble gases in the liquid or solid state.

See Also

🌷 What is a period of the periodic table? Period (periodic table). 2022-11-21

The van der Waals force increases with increasing atomic size and therefore, in general, the boiling and melting points of He to Rn increase.

(c) Zeff is defined as the effective nuclear charge that an electron experiences due to shielding of the inner electrons of the nucleus such that the Zeff maximum is smaller.

And Zeff reaches a maximum in the noble gas configuration (Zeff = 8). In this electronic configuration, each electron feels the attraction of 8 protons. Since Zeff reaches a maximum, there is no shielding effect on electrons in noble gases.

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