Warm-Up 12/10/13 Name the following ionic compounds Fe2O3 CaCl2 Be(NO3)2 Warm-Up 12/10/13

Covalent Bonding 12/10/13

Review: Two Main Types Covalent Nonmetal-Nonmetal Ionic Nonmetal-Nonmetal Electrons are shared because all atoms involved are electron acceptors (takers) Ex) CO2 or H2O2 Metal-Nonmetal Complete electron transfer from the metal (donator) to the nonmetal (acceptor) Ex) NaCl or Fe2O3 Review: Two Main Types

There is not complete electron transfer—can not model this in the same way. We have to show what atoms are sharing electrons (bonding together) to reach a Noble Gas Configuration.

Covalent Bonding & Lewis Structures

Rules for writing Covalent compound Lewis structures (Molecules) Example NH3

Example: Water

Your Job! Work on the Loopy Dot Diagrams Activity DO NOT eat the dirty fruit loops. You can eat some fresh ones tomorrow. Clean up your spot for the next hour! We will have a few minutes to wrap up tomorrow.

Warm-Up 12/11/13 (NH4)2S AuP Sr3N2 More naming practice! Name the following ionic compounds. You may use the flow chart to help you! (NH4)2S AuP Sr3N2

Making Lewis Structures (without Fruit Loops) Wednesday 12/11/13 Making Lewis Structures (without Fruit Loops)

Things to Remember The goal of bonding is to obtain a “Noble Gas Configuration.” For most atoms, this means having 8 valence electrons. Covalent compounds do this through sharing electrons, which we show using Lewis Structures.

3 Easy Steps for Making Lewis Structures…

1.Sum the valence electrons from all the atoms in the molecule. -Do not worry about which electron comes from which atom.

Example: PCl3 Sum the valence electrons

2.Use a pair of electrons in the form of a line to show a bond between each pair of atoms. -The center atom is usually by itself in the formula. It also needs to form a lot of bonds to meet the Octet Rule.

Example: PCl3 Set up the “skeleton” structure If a line means 2 electrons, how many have we already put in the Lewis structure?

3.Arrange the remaining electrons to satisfy the “duet rule” for Hydrogen and the octet rule for other elements. -Note: C, N, O, and F will never violate the octet rule; other elements can. -If an atom violates the Octet Rule, it usually is the central atom.

Example: PCl3 Fill in the remaining valence electrons

Double or Triple Bonds Some atoms will share more than just one electron with another atom Double bond: total of 4 electrons between two atoms Triple Bond: total of 6 electrons between two atoms

Your Job Turn in the Loopy Dot Diagram worksheet Complete the Lewis Dot Structures Practice Problems (DUE Friday) QUIZ: Monday 12/16 TEST: Thursday 12/19