Polarizability

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005388369
Posts: 73
Joined: Sat Sep 28, 2019 12:16 am

Polarizability

Postby 005388369 » Sun Nov 17, 2019 1:10 pm

What's the concept behind the polarizability of anions/cations?

Christine Honda 2I
Posts: 116
Joined: Sat Sep 14, 2019 12:17 am

Re: Polarizability

Postby Christine Honda 2I » Sun Nov 17, 2019 1:14 pm

Typically, cations will have less polarizability because there are less electrons and therefore the effective nuclear charge on the electrons are stronger and pulled in closer to the nucleus. Therefore, it is harder to "distort" the electron cloud making it less polarizable. The opposite is said for anions.

MinuChoi
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

Re: Polarizability

Postby MinuChoi » Sun Nov 17, 2019 1:17 pm

Polarizability in anions is how easily the electron cloud of an atom is distorted. It's a greater value for larger anions.
For cations, polarizability is low but polarizing power is high (how easily it can attract the electrons from another atom. This value is typically greater for smaller, more positively charged cations).
These values are related to how easily certain atoms can form dipole moments.

Martina
Posts: 111
Joined: Thu Jul 25, 2019 12:16 am

Re: Polarizability

Postby Martina » Sun Nov 17, 2019 8:18 pm

Polarizability increases with size and negative charge. So larger anions have the highest polarizability.

John Arambulo 1I
Posts: 58
Joined: Sat Jul 20, 2019 12:15 am

Re: Polarizability

Postby John Arambulo 1I » Sun Nov 17, 2019 9:00 pm

Polarizability is a concept of size with anions and cations. Since anions are larger than their respective neutral states because of having more electrons, it is easier to distort (move the electrons around the atom) the electron cloud. With respect to cations, they have polarizing strength, meaning that they can penetrate these polarizable anions and shift the electrons around the atom. This is important in determining ionic and covalent character, bond strength, dipole moments, intermolecular forces, and strength of acids and bases.


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