1. Chapter 6 Section 3: Periodic Trends

2. Trends in Atomic Size Diatomic Molecules 1. 2. Ex:

3. Trends in Atomic Size Atomic Radius 1. 2. Measured in:

4. Trends in Atomic Size In general, atomic size –_________ top to bottom –_________ right to left

5. Trends in Atomic Size Group Trends in Atomic Size –Moving down a group 1. An energy level… 2. Positive charge … –“_________ _________” More energy levels “shield” the electrons from the pull of the positive nucleus. –THEREFORE

6. Trends in Atomic Size Periodic Trends in Atomic Size –Moving across a period 1. Add… 2. Proton adds … 3. Pulls … –THEREFORE

8. Arrange the following in order of decreasing atomic size: sulfur, chlorine, aluminum, and sodium. Arrange the following in order of increasing atomic size: boron, thallium, gallium Practice

9. Ions Ion 1. Atom or group of atoms with a ___________ 2. Electrons are … Cation 1. 2. Positive charge (____, ____) Anion 1. 2. Negative charge (Ex:____, ____)

10. Trends in Ionization Energy Ionization Energy- 1.energy required… 2. First Ionization Energy- 3. Second Ionization Energy- much larger amount of energy is required

11. Trends in Ionization Energy First Ionization energy –___________ left to right –___________ bottom to top

12. Trends in Ionization Energy Group Trends in Ionization Energy 1.Moving down a group… 2. Outer electrons farther from… 3. THEREFORE

13. Trends in Ionization Energy Periodic Trends in Ionization Energy 1.Moving across a period… 2.THEREFORE

14. Arrange the following in order of decreasing first ionization energy: iron, scandium, krypton, potassium. Arrange the following in order of increasing first ionization energy: silicon, lead, tin, carbon Practice

15. Trends in Electronegativity Electronegativity –ability of an atom to … Predicts the type of bond that an atom will form: 1. 2.

16. Trends in Electronegativity Electronegativity 1. _________ bottom to top 2. _________ left to right 3. Includes … 4. Electronegativity of __________ ________ varies 5. _______ ________ excluded (rarely form compounds)

18. Arrange the following in order of increasing electronegativity: silver, tin, rubidium, xenon Arrange the following in order of decreasing electronegativity: arsenic, antimony, nitrogen, bismuth Which element has the highest electronegativity? Practice