Polarizability and polarizing power

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Polarizability and polarizing power

Postby 005199302 » Mon Nov 12, 2018 2:08 pm

What are the conceptual reasons behind the trends of polarizability and polarizing power? Specifically, why are both affected by size, effective nuclear charge, and electronegativity?

Akhil Paladugu 3G
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Joined: Fri Sep 28, 2018 12:26 am

Re: Polarizability and polarizing power

Postby Akhil Paladugu 3G » Mon Nov 12, 2018 2:28 pm

I found a website that talks about this as such
http://wwwchem.uwimona.edu.jm/courses/C ... ajans.html

The polarizing power and polarizability that enhances the formation of covalent bonds is favoured by the following factors:

Small cation: the high polarizing power stems from the greater concentration of positive charge on a small area. This explains why LiBr is more covalent than KBr (Li+ 90 pm cf. K+ 152 pm).

Large anion: the high polarizability stems from the larger size where the outer electrons are more loosely held and can be more easily distorted by the cation. This explains why for the common halides, iodides, are the most covalent in nature (I- 206 pm).

Large charges: as the charge on an ion increases, the electrostatic attractions of the cation for the outer electrons of the anion increases, resulting in the degree of covalent bond formation increasing.

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