Chemical Bonding
Three Types of Chemical Bonds
• Covalent Bond
• Ionic Bond
• Metallic Bond
Covalent Bond
• Form between atoms of a non-metal and a non-metal
• Valence electrons are shared to form a bond from an electron pair (one from each atom)
• Can form single, double, or triple bonds
Ionic Bond
• Ionic bonds form between a metal and a non-metal
atom
• Valence electrons are transferred from the cation
(metal) to the anion (non-metal)
• No actual bond is formed, but the atoms are held
together by electrostatic forces (+/-)
Metallic Bond
• “Sea of electrons”
• Analogous to Thomson’s plum pudding
• Very slow movement
Lewis Dot Structure
• Lewis structures (also known as Lewis dot diagrams) are diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.
• Follow the Octet Rule and the Duet Rule
• Let’s Practice
Models of Covalent/Molecular Compounds
3D Model
• Draw a space filling model or a ball and stick
model for your covalently bonded molecule
• Include a Lewis Dot Structure
• Include the identification of the Electron Domains
• Fill up the entire paper, use color (no pencil)
Review (1)
• List three types of chemical bonding
• What are the substances that make up each type of
bond
• What is a positively charge ion called? A negatively
charged ion?
• Draw the Lewis Dot Structure for NH3
Schedule Today
• FRIDAY - 11/13 Pep Rally Schedule
• 1st period 8:50 – 9:20
• 2nd period 9:25 – 10:35
• Release for pep rally – 10:35
• 3rd - 5th normal bell schedule
Review (2)
• Draw the Lewis Dot Structure and identify the
electron domains for the following compounds:
• CO2
• CO
• HBr
• NH3