2D.9 vs 2D.11 in 7th edition

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Henry Krasner 1C
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Joined: Fri Sep 28, 2018 12:15 am

2D.9 vs 2D.11 in 7th edition

Postby Henry Krasner 1C » Thu Nov 29, 2018 12:28 pm

In 2D.9, the molecules are ordered so that smaller, more highly charged cations have a greater polarizing power.
Yet in 2D.11, the molecules are ordered so that polarizability increases as the ion gets larger and less electronegative.
How does this make sense? Is there a difference in polarizability and polarizing power?

Sona Hakobyan 3J
Posts: 45
Joined: Fri Sep 28, 2018 12:25 am

Re: 2D.9 vs 2D.11 in 7th edition

Postby Sona Hakobyan 3J » Thu Nov 29, 2018 2:16 pm

Yes there is a difference. Cations have high polarizing power if they are small and highly charged because they have a higher ability to distort e- cloud of the anion because their positive center pulls in the electrons from the anion. On the other hand, anions polarizability increases with their size and number of e- because their electrons aren't as strongly attached and are easily distorted towards the cation's positive charge. Polarizing power and polarizability are basically opposite in meaning.


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