1. Periodic Table: Patterns

2. Mendeleev’s Predictions PropertyEkasiliconGermanium atomic mass7272.61 density (g/cm³)5.55.35 melting point (°C)high947 colorgrey oxide density (g/cm³)4.7 chloride boiling pointunder 100 °C86 °C (GeCl 4 ) chloride density (g/cm³)1.9

3. Mendeleev’s Prediction PropertyEkaaluminiumGallium atomic mass6869.72 density (g/cm³)6.05.904 melting point (°C)Low29.78 oxide's formula Ea 2 O 3 (density: 5.5 g/cm³) (soluble in both alkalis and acids) Ga 2 O 3 (density: 5.88 g/cm³) (soluble in both alkalis and acids) chloride's formulaEa 2 Cl 6 (volatile)Ga 2 Cl 6 (volatile)

4. Periodic Law Elements are arranged by atomic number, there is a periodic repetition in their physical and chemical properties.

5. Periodic Table Horizontal rows: –Called “periods” –7 periods Show the number of the shell

6. Periodic Table Vertical columns: –Called “groups” –Show the valance electrons –Elements in a group have similar physical and chemical properties

7. Do Now Write the noble gas configuration and dot diagram for the following elements by only using the periodic table Nitrogen Potassium Manganese Iodine Germanium

8. Periodic Table with f-block in place

9. Element Characteristics Atomic radius –Half the distance between the nuclei of two atoms. (Atoms are the same and bonded together) Radius size increases

10. Element Characteristics Ionization energy –Energy required to remove an electron from an atom Easier to remove an electron from group 1 than group 8 Easier to remove electrons that are farther away from the nucleus (elements at the bottom of a group) Ionization energy increases Ionization energy generally increases

11. Element Characteristics Electronegativity –It is a measure of the element's ability to attract the electrons which are in a bond Electronegativity increases

12. Element Characteristics Liquids Solids More metallic More nonmetallic Periodic Table

13. Periodic Table Trends: Summary Atomic radius decreases Ionization energy and Electronegativity increase