Oct 1 - Fri, 1 Oct 10 Announcements Lecture 1 Types of...

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1 Fri, 1 Oct 10 • Announcements • Lecture 1 – Types of chemical Bonds (13.1) – Electronegativity (13.2) – Bond polarity and dipole moments (13.3) Chemical Bonds Chemical bond is a term used to characterize an interaction between two atoms that results in a reduction in the energy of the system relative to the isolated atoms. The degree of energy reduction or “stabilization” is given by the energy required to break the bond (known as the “bond energy”). This stabilization is achieved by the interaction of the electron densities on neighboring atoms.
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2 When Na(s) is put in contact with Cl 2 (g), a rapid and very exothermic reaction occurs, resulting in a white, granular solid. If this solid is melted, it will conduct electricity, indicating that it contains charged species: Na + and Cl - . Ionic Bonds Na(s) Cl 2 (g) Why the formation of Na + and Cl - ? In short, Na + and Cl - are more energetically stable than atomic Na and Cl…we can rationalize this by considering the electronic structure of the ions relative to the atoms: Ionic Bonds (cont)
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Oct 1 - Fri, 1 Oct 10 Announcements Lecture 1 Types of...

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