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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)?
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-
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