Chapter 5 Focus on slides 31 to end. Be sure you understand the information and are able to complete the activities on slides 35, 43, 44, 46, 53, 57, 62, 63, 64 You will be asked to draw out orbital diagrams and electron configurations. You must understand the concept of valance electrons.

Learning Check Write the orbital diagrams for 1. Nitrogen 1s 2s 2p 3s 3p 2. Oxygen 3. Magnesium

Chapter 6 Rule of 8, the octet Using arrows show the exchange or sharing of electrons to form compounds. see the following slides Study the naming of ionic and covalent compounds from the formulas and writing formulas from compound names Memorize the names and formulas for the polyatomic ions and how to use them to write formulas and compound names

Charge Balance in NaF The formulas of ionic compounds are determined from the charges on the ions. atoms ions     – Na  +  F :  Na+ : F :  NaF     sodium fluorine sodium fluoride The overall charge of NaF is zero (0). Na+ F- = NaF (1+ ) + (1-) = 0

Using Lewis Electron Dot Symbols Br Ca + →

Using Lewis Electron Dot Symbols Al + N →

Writing Ionic Formulas from Charges Charge balance is used to write the formula for sodium nitride, a compound containing Na+ and N3−. Na+ 3 Na+ + N3− = Na3N 3(+1) + 1(3-) = 0 Note: the subscript 3 for three sodium ions.

Charges of Representative Elements Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

Some Ionic Compounds with Two Elements Formula Ions Name NaCl Na+ Cl- sodium chloride K2S K+ S2- potassium sulfide MgO Mg2+ O2- magnesium oxide CaI2 Ca2+ I- calcium iodide Al2O3 Al3+ O2- aluminum oxide

More Ionic Compounds Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

Nick the Camel Craved and ate a Clam Supper in Phoenix.

Molecular Geometries or Shapes

Be able to draw out electron dot foumulas for simple covalent compounds like those in your lecture notes. Know how to use the table of electronegativities. Be able to distinguish between ionic bonding, covalent bonding, hydrogen bonding, dipole dipole or polar bonding, and non polar dispersion forces of attraction. Be able to use arrows to describe the dipole in a polar molecule.

For Chapter 8 see the items listed on the study guide.