Ionic radius

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Maria Roman 1A
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Joined: Fri Apr 06, 2018 11:04 am

Ionic radius

Postby Maria Roman 1A » Sat May 05, 2018 12:14 am

how can you tell which anion is larger?

O- and S2-

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Re: Ionic radius

Postby Chem_Mod » Sat May 05, 2018 12:48 am

When we compare the O and S as the atoms (before assessing the affects of the negative charge), O and S are in the same group with O atom smaller due to 1 less electron shell (less shielding). Then if we look at the negative charges they acquire and compare, and based solely on this gaining 2 electrons is worse for shrinking the atomic radius (more electrons acquired weakens the nucleus's effective nuclear charge). For both of these reasons O- is smaller than S2-.

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