Greater polarizability of larger molecules

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Emmaraf 1K
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Joined: Sat Oct 20, 2018 12:16 am

Greater polarizability of larger molecules

Postby Emmaraf 1K » Wed Nov 07, 2018 6:25 pm

I get that larger molecules have more electrons, but why does that cause greater polarizability? Is it because the more electrons there are, the more chances there are for electrons to become unequally distributed to create a partial negative and partial positive charge within the molecule?

Kelsey Warren 1I
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Re: Greater polarizability of larger molecules

Postby Kelsey Warren 1I » Wed Nov 07, 2018 6:41 pm

I was under the impression that the larger the molecule, there's more electrons and more electron shielding. The outer electrons of a large atom are less tightly held than for a smaller atom so they're able to be pulled by an attractive force more easily than for a smaller atom.

Hilda Sauceda 3C
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Joined: Fri Sep 28, 2018 12:24 am

Re: Greater polarizability of larger molecules

Postby Hilda Sauceda 3C » Sun Nov 11, 2018 12:06 pm

The greater the number of electrons, the less control the nuclear charge has on charge distribution, and thus the increased polarizability of the atom.

Maharsh Patel 4E
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Joined: Fri Sep 28, 2018 12:27 am

Re: Greater polarizability of larger molecules

Postby Maharsh Patel 4E » Sun Nov 11, 2018 12:26 pm

Polarizability is the ability for a molecule to form dipoles. This has to due with the number of electrons in the molecule and the size of the molecule. The larger the molecule, the lower the effective nuclear charge is on the outer electrons. This means that it is easier to distort the outer electrons so that they form instantaneous dipoles. Also, if you have more outer electrons, then the instantaneous dipoles that are formed will be stronger.

Diana Bibireata 1B
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Joined: Fri Sep 28, 2018 12:23 am

Re: Greater polarizability of larger molecules

Postby Diana Bibireata 1B » Sun Nov 11, 2018 1:11 pm

In larger atoms the outermost electrons are less tightly held because the nucleus exerts a weak control over these electrons. Therefore they are easily distorted.

Mikka Hoffman 1C
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Re: Greater polarizability of larger molecules

Postby Mikka Hoffman 1C » Sun Nov 11, 2018 2:03 pm

bigger molecules have more electrons, and therefore more electron shielding so the electrons farther from the nucleus are not as tightly held so they are more easily distorted

JiangJC Dis2K
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Joined: Fri Oct 12, 2018 12:16 am

Re: Greater polarizability of larger molecules

Postby JiangJC Dis2K » Mon Nov 12, 2018 11:39 am

Basically, the more electrons there are, the more likely or easily they are distorted. If you think about it in the diagram of circles as different n levels around the nucleus, the electrons are getting further and further away and filling more n orbitals. Therefore, the further electrons experience a weaker Zeff or effective nuclear charge and are not held as stable.


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