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CHEM 110 (151)
Lecture

Chemical bonding

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Department
Chemistry
Course
CHEM 110
Professor
Ariel Fenster
Semester
Fall

Description
th October 6 , 2011 CHAPTER 10 – Chemical Bonding Types of Bonding: Ionic: transfer of electrons from one atom to another  Cation and anion pair  Positive charge is smaller than the negative charge  Examples: NaCl, KBr, MgO (salts) Covalent: sharing of electrons between atoms  Example: H ,2CH , 4 02 graphite, diamond Metallic Bonding: delocalization of electrons between atoms  Good conductions  Example: Zn, Cu, Fe, metal alloys Pure Covalent Bonds: both atoms share equally the bonding electrons Polar Covalent Bonds: electrons unequally shared  Example: HF Hydrogen Fluoride: Fluorine has a greater electron affinity than hydrogen, so there is a greater electron density around fluorine o Sharing of electrons, however bond is polarized o Greater pull for electrons due to more nuclei and protons in F Dipole Moment: polar molecules are characterized by a dipole moment, directed from the positive to
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