Chy102-Lecture 07 - 1 General Chemistry Chem102 for...

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Unformatted text preview: 1 General Chemistry Chem102 for Engineering Dr. Raafat 7 th lecture 19/12/2007 D o n e 2 Objectives The Localized Electron (LE) Bonding Model Lewis Structure (Lewis formula) Lewis structure for molecules with single bonds Writing Lewis structures for molecules with more than one central atom Lewis structure for molecules with multiple bonds Resonance [Delocalized electron-pair Bonding] Formal charge [Selecting the best Lewis structure for a molecule] Exception to the octet rule Lewis structures: comments about the octet rule 3 The Localized Electron (LE) Bonding Model A molecule is composed of atoms that are bounding together by sharing pairs of electrons using the valence electrons of the bounded atoms Electron pairs in the molecule are assumed to be: 1. localized on a particular atoms (lone pairs) or 2. localized in the space between the two atoms (bonding pairs) . It is known that one of the most important requirement for the formation of stable compound is that the atoms achieve noble gas electron configuration Duet rule : Consider two hydrogen atoms , each with one electron. : .. F : H .. : .. F- H .. 4 Valence Electrons 1A 1A 2A 2A 3A 3A 4A 4A 5A 5A 6A 6A 7A 7A 8A 8A Number of valence electrons is equal to the Group number 1 2 13 14 15 16 17 18 1A 1A 1 5 Lewis Structure (Lewis formula) The Lewis structure of a molecule shows how the valence electrons are arranged among the atoms in the molecule . I- Lewis structure for molecules with single bonds Steps for writing Lewis structures for NF 3 1. Place the atoms relative to each other. The central atom is usually the one written first in the formula , put this in the center of the molecule or ion....
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Chy102-Lecture 07 - 1 General Chemistry Chem102 for...

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