Stable Ions - Stable Ions Predicting Stable Anions and...

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Unformatted text preview: Stable Ions Predicting Stable Anions and Cations Main group elements (Group A) will gain or lose minimum number of electrons to have a filled shell (noble gas configuration). Example: Na 1s 2 2s 2 2p 6 3s 2 → Na + 1s 2 2s 2 2p 6 3s 2 + e- Cl 1s 2 2s 2 2p 6 3s 2 3p 5 + e- → Cl- 1s 2 2s 2 2p 6 3s 2 3p 6 Transition group elements (Group B) generally lose outer shell s - electrons. Many also lose electrons to have either a filled or half-filled subshell. Example: Cu [Ar] 4s 2 3d 9 → Cu 2+ [Ar] 3d 9 + 2 e- The Cu 2+ lost its outer shell s electrons. Fe [Ar] 4s 2 3d 6 → Fe 3+ [Ar] 3d 5 + 3 e- The Fe 3+ has a half-filled 3d subshell. Ionic sizes A cation is smaller than its parent atom. An anion is larger than its parent atom. Generally, ion size increases going down a group. Change in ion size horizontally is Generally, ion size increases going down a group....
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Stable Ions - Stable Ions Predicting Stable Anions and...

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