1372 Lec 27Sep2011 - General Chemistry 4 th edition, Hill,...

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Unformatted text preview: General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 1 General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 2 2 General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 3 • Sections 9.1-9.4, 9.6-9.7 • Forces called chemical bonds hold atoms together in molecules and keep ions in place in solid ionic compounds. • Chemical bonds are electrostatic forces; they reflect a balance in the forces of attraction and repulsion between electrically charged particles. Chemical Bonds: A Preview Chapter Nine: Chemical Bonds Chapter Nine: Chemical Bonds General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 4 Energy of Interaction Closer together; attraction increases. At 74 pm, attractive forces are at a maximum, energy is at a minimum. Closer than 74 pm, repulsion increases. Hydrogen nuclei far apart; just a little attraction. General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 5 • Valence electrons play a fundamental role in chemical bonding. • When metals and nonmetals combine, valence electrons usually are transferred from the metal to the nonmetal atoms, giving rise to ionic bonds . • In combinations involving only nonmetals, one or more pairs of valence electrons are shared between the bonded atoms, producing covalent bonds . • In losing, gaining, or sharing electrons to form chemical bonds, atoms tend to acquire the electron configurations of noble gases. The Lewis Theory of Chemical Bonding: An Overview General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 6 • In a Lewis symbol , the chemical symbol for the element represents the nucleus and core electrons of the atom.represents the nucleus and core electrons of the atom....
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This note was uploaded on 12/19/2011 for the course CHEM 1372 taught by Professor Staff during the Spring '08 term at University of Houston.

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1372 Lec 27Sep2011 - General Chemistry 4 th edition, Hill,...

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