1. Periodic Table An Introduction

2. Pre-thinking questions Record these prior to your notes 1.How is the periodic table organized? 2.What are examples of physical and chemical properties? 3.Brainstorm activity 1.Pick a category you know well (fruits, candy bars, singers, etc) 2.For 60 seconds, name as many items in your chosen category as you can. 3.Create an organized table that includes each item you named. 4.Write a short summary explaining your organization system. 5.*Save your table. Those with the best table will earn extra points.

3. Periodic table: a start 1829-1869 different systems proposed to organize elements 1869 Russian chemist Mendeleev published a table of elements Mendeleev put elements in order of increasing atomic mass In order to keep elements in groups by properties, Mendeleev had to break this order Modern tables are organized by atomic number

4. Periodic Law When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties.

5. Groups – vertical columns on table with similar chemical and physical properties

6. Periods – rows on periodic table with properties changing left to right, but following a similar pattern for each row

7. Representative elements (group A)

8. Transition elements (group B)

9. Numbering groups Groups can be numbered 1-18, or by representative (1A-8A) or with Roman Numerals

10. Metals/nonmetals/metalloids

11. Metals Vs. Nonmetals Metals and nonmetals are separated by a stair step line of metalloids 75% of the table is comprised of metals Metalloids are intermediate. Their properties depend on the conditions they are in. What are the properties of metals? Nonmetals?

12. Groups There are several groups on the table with distinct properties. Alkali metals (Alkali Metal Video)Alkali Metal Video Alkaline earth metals Transition metals Lanthanides Actinides Halogens Noble gases

13. These do not include all the elements, but most of the elements belong to a group with distinct properties.

14. Summary: The periodic table has vertical groups with similar properties and horizontal periods which have periodic properties (changes as you go across) The two main groups on the table are the representative, A, group which are the tall left and right sections, and the transition, B, group which is the short center section The left hand side of the table consists of metals. The right hand side of the table consists of non-metals. The two are separated by a stair- step line of intermediate metalloids. Similar groups of elements have distinct properties