Polarizing power/polarizability periodic trends

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Leslie Cheng 4B
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Joined: Fri Sep 28, 2018 12:29 am

Polarizing power/polarizability periodic trends

Postby Leslie Cheng 4B » Wed Nov 07, 2018 12:37 pm

Can someone explain to me what the periodic trends of the polarizing power of cations and the polarizability of anions are? I believe the textbook mentioned that cations increase in polarizing power across a period left to right, for example. Why is this so?

skyeblee2F
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Polarizing power/polarizability periodic trends

Postby skyeblee2F » Wed Nov 07, 2018 2:21 pm

Smaller, more highly charged cations have greater polarizing power because they have a stronger pull on the electrons of ions. So you could generally say polarizing power increases up and across the periodic table in terms of cations.

Polarizability increases as the anion gets larger and less electronegative because they are more susceptible to the pull from anions. So you could generally say polarizability decreases up and across the periodic table in terms of anions.

gwynlu1L
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: Polarizing power/polarizability periodic trends

Postby gwynlu1L » Fri Nov 09, 2018 6:05 am

It’s good to remember that polarizing paper is the ability of an ion to pull electrons and distort the electron cloud. So, the more a cation can pul lat the electrons, the higher the power; so that must mean it needs either a large positive charge to pull on electrons or be small enough to get close to the electrons w/o too much electron electron repulsion. And vice versa for polarizability/anions.


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