1. Aim: Why do atoms bond? Do Now: 1. Write the electron configurations of the noble gases (Group 18.) What do they have in common? 2. Draw the electron dot diagrams (into table below) of elements in Periods 1 through 4; Groups 1,2 and 13-18. Group Period12131415161718 1 2 3 4

2. Aim: Why do atoms bond? How do atoms achieve stability? Explain why noble gases tend not to bond.

3. Aim: Why do atoms bond? Atoms attain a stable valence electron configuration by bonding with other atoms. Noble gases have stable electron configurations and tend not to bond.

4. Aim: Why do atoms bond? How does the gaining and losing of electrons affect the atomic radii (size) of atoms?

5. Aim: Why do atoms bond? When an atom gains one or more electrons, it becomes a negative ion and its radius increases. When an atoms loses one or more electrons, it becomes a positive ion and its radius decreases.

6. Aim: Why do atoms bond? How does the body get energy from food

7. Aim: Why do atoms bond? The bonds of water and carbon dioxide have less energy than the bonds of sugar, and the difference between the energy of the two is what is used to live. When a bond is broken, energy is absorbed. Therefore bond breaking is endothermic. When a bond is formed, energy is released. Therefore bond formation is exothermic.

8. Aim: Why do atoms bond? Essential Questions : How do atoms achieve stability? Explain why noble gases tend not to bond. How does the gaining and losing of electrons affect the atomic radii (size) of atoms? Explain why the properties of ions differ from the properties of their parent atoms. Relate an atom’s tendency to form an ion to the element’s position in the periodic table and to the octet rule. How does the body get energy from food?

9. Aim: Why do atoms bond? Atoms attain a stable valence electron configuration by bonding with other atoms. Noble gases have stable electron configurations and tend not to bond. When an atom gains one or more electrons, it becomes a negative ion and its radius increases. When an atoms loses one or more electrons, it becomes a positive ion and its radius decreases. When a bond is broken, energy is absorbed. When a bond is formed, energy is released.