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Ordering Polarizability and Polarizing Power

Posted: Wed Dec 05, 2018 1:04 pm
by Christopher Tran 1J
Order these anions in order from least to most polarizable: I-, Cl-, S2-, P3-

Order these cations in order from least to most polarizing power: Li+, Ca2+, Cs+, Ba2+

How would I go about determining the relative sizes of ions? I know that a small cation has high polarizing power, and a large anion is more polarizable.

Re: Ordering Polarizability and Polarizing Power

Posted: Wed Dec 05, 2018 1:13 pm
by Shash Khemka 1K
Anions: P3- < S2- < Cl- < I- ; Smallest to Largest


Cations: Ba2+ < Cs+ < Ca2+ < Li+ ; Largest to Smallest

Re: Ordering Polarizability and Polarizing Power

Posted: Thu Dec 06, 2018 8:24 am
by Ashley Odibo Dis3E
Can someone please explain why this is the order?

Re: Ordering Polarizability and Polarizing Power

Posted: Fri Dec 07, 2018 11:39 am
by Shibhon_Shepard
you determine the order based on the amount of electrons and the size of the atom. for Anions you are looking for the one that is more negativity. and for the cations you are looking for the most positive.

Re: Ordering Polarizability and Polarizing Power

Posted: Sat Dec 08, 2018 3:19 pm
by Ashley Odibo Dis3E
Then for the anions why isn’t the order Cl-, S-2, P-3, and I -? I understand That I has more shells therefore has more shielding, but since P,S, and Cl are in the same period and have the same number of shells then wouldn’t the ones with a higher number electrons and lower number of protons have more polarizing power?