Ranking anions/cations

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Karina Vasquez 1D
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Joined: Fri Mar 01, 2019 12:15 am

Ranking anions/cations

Postby Karina Vasquez 1D » Mon Jul 29, 2019 3:40 pm

When ranking say anions from least to greatest polarizability how does the charge determine where it would be placed when ranked? For example, ranking I-, Cl-, S2-, P3- how does the charge determine which of S2- and P3- will be ranked first (least to most polarizable)?

Chem_Mod
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Re: Ranking anions/cations

Postby Chem_Mod » Mon Jul 29, 2019 4:48 pm

S2- and P3- have the same number of electrons. However, S has a greater number of protons than P. This means the electrons held by S experience a greater attractive force to the nucleus of the S ion than the electrons held by P, making it harder to distort the electron cloud away from S2-. Thus P3- is more polarizable than S2-

Kguox1B
Posts: 29
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Re: Ranking anions/cations

Postby Kguox1B » Mon Jul 29, 2019 9:15 pm

Today in the review session, they said that when in the same row, charge becomes the determinant of which one is greater.


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