2/18/11

Post date: Feb 18, 2011 5:2:46 PM

• • Bell ringer: Write the names for NiCl2, MgCl2, and OCl2

  • Drawing covalent bonds (continued)

• Covalent bonds practice 2 (due Tuesday)

  • • Draw the movement of electrons, write the formula, and write the name for the following combinations of elements:

      • 1. Carbon and Oxygen

      • 2. Sulfur and Bromine

      • 3. Silicon and Fluorine

      • 4. Nitrogen and Oxygen

      • 5. Phosphorus and Sulfur

• • Metallic bonds

    • Cross between ionic and covalent compounds

    • Atoms group together, similar shape to a network

    • Outer layers of electrons overlap, and are shared with neighbors

      • Electrons are shared between ALL atoms, and can flow freely

    • Metals conduct electricity and are flexible because their atoms and electrons can move freely throughout the metal's structure

  • Polyatomic Ions

    • Breaking down the word:

      • Poly = many

      • Atomic = made of atoms

      • Ion = body that has a non-zero charge

    • Molecules with a charge

    • Stick together as a group (behave like a single unit), can bond with other ions

    • Many common examples

      • NaHCO3 = baking soda

      • Na2CO3 = used to make soaps and cleaners

    • Oppositely charged polyatomic ions can bond together to make larger compounds

      • (NH4)2SO4

    • Use parentheses to separate a polyatomic ion from the rest