Periodic Table Trends

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John Calonia 1D
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Joined: Wed Sep 30, 2020 9:49 pm

Periodic Table Trends

Postby John Calonia 1D » Mon Nov 16, 2020 12:40 pm

What are the trends for polarizability and polarizing power on the Periodic Table?

Ria Nawathe 1C
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Re: Periodic Table Trends

Postby Ria Nawathe 1C » Mon Nov 16, 2020 12:47 pm

For anions, polarizability increases as you go down a group since the atomic radius and number of electrons increases and the effective nuclear charge decreases. In general, the larger the radius and the more electrons an atom has, the more polarizable. For polarizing power, the smaller the atomic radius and greater the magnitude of charge on the cation, the greater the polarizing power. Having a greater charge density increases the electrostatic attraction between the positively charge nucleus and the anion's electrons. Hope this helps!

Angel More
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Re: Periodic Table Trends

Postby Angel More » Mon Nov 16, 2020 12:51 pm

The polarizing power increases from left to right across a period and decreases down columns of the periodic table.

Polarizability decreases from left to right and increases down columns of the periodic table.

gabbi_r2C
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Re: Periodic Table Trends

Postby gabbi_r2C » Mon Nov 16, 2020 12:51 pm

Hey John,

Generally, an atom has high polarizability if it has a large atomic radius and many electrons, so based on the trends of atomic radius, polarizability increases down a group and decreases down a period. Atoms that have high polarizing power tend to be smaller and positive, so based on ionization and atomic radius trends, polarizing power decreases down a group. I don't think they increase down a period as you might expect though, because then the atoms have more electrons and don't tend to form cations, but anions instead; ie, F- will not have a greater polarizing power than Na+.

I hope that helps :)

Nandhini Ekambaram 1L
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Joined: Wed Sep 30, 2020 9:58 pm

Re: Periodic Table Trends

Postby Nandhini Ekambaram 1L » Mon Nov 16, 2020 1:20 pm

Here is a link to the picture that helped me memorize the trends: https://en.wikipedia.org/wiki/Periodic_ ... trends.svg
Hope this helps!


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