1. Chemical Bonds: Stability in Bonding Chapter 20 Section 1

2. Compounds Combination of Elements Properties different than the individual elements Ex: Sodium Chloride (NaCl)  Table Salt Na – highly reactive Cl – Poisonous Gas NaCl - Stable

3. Formulas Chemical Formula – The elements a compound contains and the exact number of atoms of each element Examples: Sand – Silicon Dioxide – SiO 2 Cane Sugar – Sucrose – C 12 H 22 O 11

4. Valence Electrons

5. Atomic Stability Stable when the outer energy level is complete Noble Gases – 8 valence electrons

6. Atoms with partially stable outer energy levels can gain, lose, or share electrons

7. Ionic Bond NaCl

8. Covalent Bond H 2 O