1. Rally-Table Write out the Electron Configuration for the following elements Write out the Electron Configuration for the following elements LiLi MgMg B C P S F ArAr

2. Periodic Trends and Organization Essential Question: How does the periodic table organize the elements according to their atomic structure and chemical reactivity? Get out your handout of the periodic table

3. Ionization Energy The amount of energy required to remove an electron from an atom or ion. The amount of energy required to remove an electron from an atom or ion. (to become a cation)(to become a cation) IE depends on the average electron distance from the nucleus and the attraction of the nucleus. IE depends on the average electron distance from the nucleus and the attraction of the nucleus. Why do you think the distance between the valence electrons and the nucleus determines the amount of energy required to remove electrons from the atom? Why do you think the distance between the valence electrons and the nucleus determines the amount of energy required to remove electrons from the atom?

4. Ionization energy decreases as you move down a group and increases as you move up a group.Ionization energy decreases as you move down a group and increases as you move up a group. The farther down you go down the more reactive the element.The farther down you go down the more reactive the element. Ionization Energy Ionization energy increases across a period.Ionization energy increases across a period. Make an inference as to why you think this is so.Make an inference as to why you think this is so.

5. Atomic Radii: Size of the atom Atomic radii increases down a group. Atomic radii increases down a group. Atomic radii decreases across a period (left  right) Atomic radii decreases across a period (left  right)

6. Electronegativity The ability of an atom to attract electrons. The ability of an atom to attract electrons. The higher the electronegativity, the more strongly an atom attracts electrons. The higher the electronegativity, the more strongly an atom attracts electrons. row

7. Summary of all Periodic Trends SsSs Electronegativity

8. Numbered Heads Together: Applying the Trends Based on what we know about Ionization energy and how it changes as you move through the periodic table, Predict which element on the periodic table is the most reactive? Based on what we know about Ionization energy and how it changes as you move through the periodic table, Predict which element on the periodic table is the most reactive? Is it a metal or a nonmetal? Is it a metal or a nonmetal? Based on what we know about Electronegativity and its trends across the table, predict which element is the most reactive? Based on what we know about Electronegativity and its trends across the table, predict which element is the most reactive? Is it a metal or non metal? Is it a metal or non metal? Drawing conclusions: Which element is the most reactive metal and which is the most reactive nonmetal on the periodic table? Drawing conclusions: Which element is the most reactive metal and which is the most reactive nonmetal on the periodic table?

9. Numbered Heads Together Based on the trends, which element should be the largest and which should be the smallest? Based on the trends, which element should be the largest and which should be the smallest? Using the trends, explain why some elements will tend to gain electrons while some will tend to lose electrons when forming ions. Using the trends, explain why some elements will tend to gain electrons while some will tend to lose electrons when forming ions. Drawing conclusions: Which atoms will become anions and which will become cations? Drawing conclusions: Which atoms will become anions and which will become cations?

10. http://www.webelements.com/ This is a neat site for information on any element in the periodic table. This is a neat site for information on any element in the periodic table.