; 3.2 How Atoms Combine
Documents
Resources
Learning Center
Upload
Plans & pricing Sign in
Sign Out
Your Federal Quarterly Tax Payments are due April 15th Get Help Now >>

3.2 How Atoms Combine

VIEWS: 9 PAGES: 13

  • pg 1
									3.2 How Atoms Combine
               Compounds
• Two or more elements   • Ex:
  combined chemically.           water
                                 carbon dioxide
                                 table salt
            Chemical Bonds
• Covalent bonds



• Ionic bonds



• Metallic bonds
           Covalent Bonds
• Electrons are shared.
• Both elements nonmetals.
• Molecules are formed with covalent bonds.

• Ex: H2O
     CO2
     C6H12O6
               Ionic Bonds
• Electrons are transferred.
• One atom gains, one loses electrons.
• Electrical attraction between ions of
  opposite charge.
• Between metal – nonmetal.
• Ex: NaCl, KF, CaBr2
Ionic Bond
             Metallic Bonds
• In metals, valence electrons are shared, free
  to move about.
• Metal—metal.
• Metals conduct electricity easily.
Polar Covalent Molecules
            • Electrons are shared,
              but not equally.
            • Some atoms have a
              stronger pull for the
              electrons.
            • Molecule not
              symmetrical in shape
              (unbalanced).
   Nonpolar Covalent Molecules
• Equal distribution of
  charge around a
  central atom.

• Molecule has a
  symmetrical shape
             Water Molecule
• Water is a polar
  molecule.
• Electrons are not
  shared equally by the
  H and O atoms.
                Surface tension
• Water molecules stick
  together.

• Forms a thin surface
  on top.

								
To top