2/8/11

Post date: Feb 08, 2011 5:41:47 PM

Bell Ringer: Why do we have 3 different ways to draw molecules?

• • Grade tests (in class)

  • Elements to memorize name, symbol, and location on periodic table:

    • Hydrogen

    • Helium

    • Lithium

    • Beryllium

    • Carbon

    • Nitrogen

    • Oxygen

    • Fluorine

    • Sodium

    • Magnesium

    • Aluminum

    • Sulfur

    • Chlorine

    • Iron

    • Nickel

    • Copper

  • Electrons

    • Arranged in different levels or orbitals (shells), with each level being able to hold a certain number of electrons

      • • Fill orbitals from inside to outside

        • Inside orbital only holds 2 electrons, the rest (that we study in this class) hold 8

    • Valance electrons - the electrons in the outer-most level, involved in chemical bonding

      • • Periodic table shows us how many valence electrons different atoms have by which column the element is in

• • • Atoms want to have their valence electron shell level filled up completely, and can do this in 2 ways

      • • Take more electrons from another atom or give up electrons to another atom

          • • When an atom gains electrons or gives them up, it is called an ion

        • Share electrons with another atom

        • These two methods result in 2 different types of bonds

• • Ionic bonds