polarizing power of a cation

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CaminaB_1D
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

polarizing power of a cation

Postby CaminaB_1D » Sun Nov 11, 2018 11:01 pm

can someone explain the polarizing power of a cation? Does it follow a trend on the periodic table? Does it apply for compounds?

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

Re: polarizing power of a cation

Postby Ana Pedreros » Sun Nov 11, 2018 11:13 pm

A cation has high polarizing power because they can exert a strong pull on the anions electrons. The smaller the radius, the closer the distance between the two ions, and the stronger the distortion of the electrons towards the cation. The trend in the periodic table is that it increases from left to right on a period and decreases down a group.

Ava Kjos 1D
Posts: 65
Joined: Fri Sep 28, 2018 12:19 am

Re: polarizing power of a cation

Postby Ava Kjos 1D » Sun Nov 18, 2018 3:19 pm

Polarizing power is the power of a cation to distort the shape of an anion by pulling its electrons over. In general, the smaller the ion, the more polarizing power it will have. This means that ions that are towards the top left side of the periodic table and with a greater charge will have a greater polarizing power.

Nicole Elhosni 2I
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: polarizing power of a cation

Postby Nicole Elhosni 2I » Mon Nov 19, 2018 8:00 am

The smaller the ionic radius of the cation, the greater its ability to distort the electrons of the pairing anion. So if it is between Na+ and Mg2+, Mg2+ will have a greater polarizing power because it is holding its remaining electrons super close, and is smaller as a result.


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