1. Chapter 5 (cont.) The Periodic Table

2. History of the Periodic Table Mendeleev (1860’s) –Developed the first periodic table –It was arranged by atomic mass –He was able to predict properties of elements

3. History of the Periodic Table (cont.) Moseley – developed the modern periodic table His periodic table was arranged based on atomic number

4. The Periodic Table

5. Characteristics of Metals Hard Shiny Conduct heat and electricity well Includes the transition and inner-transition metals –Inner transition metals include the lanthanide and actinide series

6. Characteristics of Nonmetals Are gases or brittle solids at room temp. Surfaces are dull Insulators

7. Characteristics of Metalloids Have properties of both metals and nonmetals

8. Period vs. Group Period –All elements in a horizontal row –7 periods on the periodic table –Arranged in increasing atomic number

9. Group –All elements in a vertical column –Sometimes called “families” –Have similar properties

10. Group 1 (IA) – Alkali Metals

11. Group 2 (IIA) – Alkaline Earth Metals

12. Group 17 (VIIA) - Halogens

13. Group 18 (VIIIA) – Noble Gases

14. Left of stair step On the stair step Right of stair step METALS NONMETALS Metals- Nonmetals- Metalloids- B. Organization of the Periodic Table METALLOIDS

15. TRANSITION “Group B” INNER TRANSITION REPRESENTATIVE “Group A” Group A- Representative Group B - Transition B. Organization of the Periodic Table

16. The Extended Periodic Table