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2/21/2016 1 Lecture 15: Chapter 6 CHMY 141 Spring 2016 Chemical Bonds Types of bonding discussed: Ionic bonds – Electron is completely transferred from one atom to the other Covalent bonds – Electron is equally shared between two atoms Sharing of electrons doesn’t always occur equally When atoms are involved in a covalent bond, one of the atoms may have a stronger ability to draw the bonding electrons to itself This ability is called electronegativity
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2/21/2016 2 Electronegativity Electronegativity is a man made value and doesn’t have a physical measurement In general, electronegativity increases when you move up and to the right Fluorine is the most electronegative When expressing a chemical formula, the least electronegative atom goes first and is also the central atom in a structure
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2/21/2016 3 Dipole Moment This is a measurement of the charge separation in a molecule This is affected by the polarity of individual bonds
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