2Elements Goal = Stability Elements want to be stableIn order to be stable they need to fill their outermost energy level completely“Complete its octet” (oct meaning 8)When outer level is filledNo Charge = StableWhen outer level is not filledCharge = Unstable
3How do we figure out and elements charge? Charge is determined by how many electrons they need to gain or lose to complete their outer levelEvery element in a group has the same chargeExample: All Halogens are -1Logical OrderGroup12131415161718Charge+1+2+3+/- 4-3-2-1
4Add the following charges to the triangles at the bottom of your periodic table
5Lets look at Magnesium. What is its charge? Lets look at Sulfur. What is its charge?
6How can elements complete their octet? 2 WaysIonic bondsOne element gives/takes electron from another elementCovalent BondsTwo elements share electrons1. The two extreme cases of chemical bonds are covalent bonds and ionic bonds. 2. When one or more pairs of electrons are shared by two atoms, a covalent bond is created. 3. An ionic bond is a bond in which one or more electrons from an atom are removed and attached to another atom, resulting in positive and negative ions which attract eachother. 4.
7Ionic BondsBond in which one or more electrons from one atom are removed and attached to another atom.It is when atoms transfer electronsOne element gives electronOne element takes electron
8How does ionic bonding work? Ionic Bonds occur between metals and nonmetalsOpposite charges are going to attractTheir charges will cancel out and become 00 = StableExample:= 0
9Lets look at an exampleWhy does NaCl work as an ionic bond?
10Na Cl-1Opposites Attract*NaCl*Neutral and stable
12How does the sharing work? Na has the 1 lone electron to share in its outermost levelCl needs 1 to complete its octetNa will give 1 electron to Cl
13Ionic Bonding Problems Step 1: Draw Lewis Dot Diagrams; Draw an arrow showing where the electron is movedStep 2: Rewrite the elements with their chargesStep 3: Write the final compoundStep 4: Write the name of the compound
14Naming Ionic Compounds When you name a compound, you first put the metal and then the nonmetal.The nonmetal word would end in “-ide” instead of whatever it normally ends inSo combining Na and Cl would beSODIUM CHLORIDE
15Ionic Bonding Problem: Sodium and Sulfur Step 1: Write Lewis dot with arrowStep 2: Write chargesStep 3: Write Final CompoundStep 4: Write Name