Lecture_18_Ions - UNIT LECTURE 2 NOTES LECTURE 18 Ions...

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U N I T 2 L E C T U R E N O T E S LECTURE 18 Ions GENERAL CHEMISTRY Fall 2009 Updated: 11/22/2011
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3.10 Ions An atom is neutral; it has a net electric charge of zero. A charged entity is an ion; an ion has gained or lost valence electrons; never by a change in protons. a. Valence electrons i. Electrons in the outermost principal energy level ii. Valence electrons involved in chemical iii. Inner (core) electrons are not involved in chemical reactions b. Examples i. Sodium (Z=11) is a neutral atom with 11 protons and 11 electrons, one of the electrons is valence electron. When the valence electron is lost, we have a sodium ion. 1. Na Na + + e - 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. Formation of Ions
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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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Lecture_18_Ions - UNIT LECTURE 2 NOTES LECTURE 18 Ions...

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