Lecture_14_Ions - LECTURE NOTES LECTURE 14 Ions GENERAL...

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L E C T U R E N O T E S LECTURE 14 Ions GENERAL CHEMISTRY Fall 2008 Updated: 11/22/2011
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I. Ions a. Valence electrons i. Electrons in the outermost principle energy level ii. Valence electrons involved in chemical iii. Inner (core) electrons are not involved in chemical reactions II. Electron Dot Notation a. An electron-configuration notation in which only the valence electrons of an atom of a particular element are shown, indicated by dots placed around the element’s symbol b. Inner (core) electrons are not shown c. These electrons are usually involved in covalent bonds Updated: 11/22/2011
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III. The Octet Rule – Ionic Compounds a. Ionic compounds tend to form so that each atom, by gaining, or losing electrons, has an octet of electrons in its highest occupied energy level IV. Formation of Ions a. Electron Configuration Changes i. Cations lose their valence electrons to attain a noble-gas configuration 1. Formation of sodium ion Na = 1s 2 2s 2 2p 6 3s 1 Na = 1s 2 2s 2 2p 6 ii. Anions
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Lecture_14_Ions - LECTURE NOTES LECTURE 14 Ions GENERAL...

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