polarizing power

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Katherine Wu 1H
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Joined: Fri Aug 30, 2019 12:15 am
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polarizing power

Postby Katherine Wu 1H » Sun Nov 03, 2019 4:10 pm

How do you figure out which ion has the most ion polarizing power? For example, with Li^+, Na^+, K^+.

Marty Hockey
Posts: 47
Joined: Wed Sep 18, 2019 12:19 am

Re: polarizing power

Postby Marty Hockey » Sun Nov 03, 2019 4:17 pm

The larger the radius of the element, the larger the polarizing power. So K would have higher polarizing power than Na, and then Na would have higher polarizing power than Li. The trend for the atomic radius is increasing as you go down a period and decreasing as you go across a row.

Sally Qiu 2E
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

Re: polarizing power

Postby Sally Qiu 2E » Sun Nov 03, 2019 4:23 pm

ions with high polarizing power cause large distortions in another atom's electron cloud. to determine polarizing power, you'll have to take into consideration the atomic radius and charge; small cations that are highly charged have the most polarizing power. due to the small size, the nucleus of the cation has a stronger pull on the anion's electrons and can, thus, cause a larger distortion.
i guess a general trend for increasing polarizing power would be left to right across a period. and it would decrease as you go down a group as the cations get larger

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Re: polarizing power

Postby Mariepahos4D » Sun Nov 03, 2019 4:56 pm

polarizing power would increase with cations of higher charge and smaller radius because electrons are held closer to the positively charged nucleus and the higher the charge on the cation, the more easily the cation can distort the negative charge of an anion

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