london forces on noble gases

[Isabelle Huerta 2I]

hi,

I was curious about the impact that london forces has on the boiling points of any elements that aren't noble gases.

thanks.

[206031457]

London dispersion forces change the boiling points of non-noble gases by increasing with the size and shape of the molecules. if ou think about it, the larger and more complex molecules experience stronger London forces, and this often leads to higher boiling points compared to smaller molecules with similar molecular weights.

[206031457]

(Also, that means we can say that molecules with higher numbers of electrons are more likely to exhibit stronger London dispersion forces, which contributes further to increased boiling points.)

[irisgu]

Hi,

London dispersion forces can influence the boiling points of elements that are not noble gases due to molecular size, molecular shape, the molecule's surface area, and electron density.

1. Molecular size
Larger molecules can form stronger London dispersion forces because there is a proportional relationship between size and strength of attraction. A higher attractive force contributes to a higher boiling point because more energy is required to break the bond.
Larger elements --> higher boiling point

2. Molecular shape
Longer, more linear molecules tend to experience stronger London forces than spherically shaped molecules of the same size. London forces occur when electrons of adjacent atoms occupy positions that allow them to form temporary dipoles, therefore, geometrically speaking, longer and linear molecules have more attractive potential.
Longer/linear molecules --> higher boiling point

3. Surface area
Molecules with a larger surface area tend to experience stronger London forces than smaller molecules of the same size. Keep in mind that surface area is more important than size when determining the strength of attraction since London forces are induced dipole-induced dipole interactions that depend on the amount of surface space available.
Larger surface area --> higher boiling point

4. Electron density
Non-noble gas elements with a higher number of electrons would have more London dispersion attraction potential. So for elements of the same period, the boiling points would increase down the row as the atomic number (number of electrons) increases.
Higher # of electrons --> higher boiling point

Hope this is helpful!