1. Ionic or Covalent

2. Ionic Compounds Bonds formed between a metal and a nonmetal cation (+) and anion (-) The anion can be an element: fluoride, chloride, sulfide, nitride, iodide, etc F 1- Cl 1- S 2- N 3- I 1- Or it could be a polyatomic: Sulfate SO 4 2-, nitrate NO 3 1-

3. Charges by tall group # Memorize these. Column#1 1 2 3 4 5 6 78 Charge +1 +2 +3 * -3 -2 -1 ** * varies: shares or loses ** Noble gases do not form ions Named using “criss-cross” method

4. Animation of Ionic CompoundAnimation of Ionic Compound 0.52minutes Animation of Ionic Formation and Properties Melting Ionic Compound

5. Covalent Compounds Animation Covalent Compound Formation 0.52m Animation Covalent Compound Formation “Shared” electrons between only nonmetals Named using prefixes

6. Comparison of Compounds IONICCOVALENT Elementsmetal and nonmetal nonmetals only State of Matter @ 25°C solid crystalssolid, liquid, or gas Conductivitywhen melted or dissolved only No Solubilityusually yesvaries greatly Melting/boiling point highlow Nameuse “criss- cross”use prefixes